PREHEAT oven to 350 degrees F.: The oven temperature gives the crust an initial set and starts the water bath heating, creating an even baking environment; you should hear a gentle hum from the oven when it stabilizes, and the air will carry a faint toasty scent as it warms, avoid placing the pan in until the temperature is reached to ensure even bake; a common mistake is opening the oven constantly while preheating, which delays reaching the correct temperature.
WATERPROOFING STEP 1 (optional but HIGHLY recommended): Place 9” springform pan in the center bottom of a slow cooker liner or oven bag. Bring the liner bag up to the top of the pan then gather excess to one side and tie it in a knot.: Place 9” springform pan in the center bottom of a slow cooker liner or oven bag. Bring the liner bag up to the top of the pan then gather excess to one side and tie it in a knot. : This step creates a barrier against any leaks when you place the springform in a water bath, and you will notice the liner snugly hugging the pan; make sure the knot is secure but not so tight that it tears the bag, since pinholes will let water in and ruin the cheesecake; avoid skipping this if your springform has any weak seams, it can prevent a watery disaster.
WATERPROOFING STEP 2 (do this over liner even if you have already done step 1 for double coverage): Place 2 large 18″ x 18″ pieces of aluminum foil on a flat surface underneath the pan in the form of a “+.” Gently fold (to make sure you don’t create any holes) up the sides of the foil around the (lined) pan.: Place 2 large 18" x 18" pieces of aluminum foil on a flat surface underneath the pan in the form of a "+." Gently fold (to make sure you don’t create any holes) up the sides of the foil around the (lined) pan. : The foil forms an extra waterproof envelope, and you should run your fingers along the seams to confirm there are no gaps; the foil will crinkle softly when molded and will reflect heat, helping to keep water out; a typical error is folding too tightly causing tiny tears, so be gentle and inspect carefully.
GREASE: Line bottom of pan with parchment paper and lightly grease the inside of your entire springform pan with nonstick cooking spray.: Line bottom of pan with parchment paper and lightly grease the inside of your entire springform pan with nonstick cooking spray. : Greasing prevents sticking and lets the cake release cleanly, you’ll notice a subtle sheen from the spray on the sides and the parchment will sit flat on the bottom; make sure the parchment is pressed to the edges so crumbs do not slip underneath; if you skip greasing you risk tearing the crust when removing the ring.
CRUST: Combine the CRUST ingredients in a medium bowl and stir until well combined. Add to springform pan and firmly press the crumbs down on the bottom of the pan until you have an even layer. (I like to use the bottom of a measuring cup to press down.): Combine the CRUST ingredients in a medium bowl and stir until well combined. Add to springform pan and firmly press the crumbs down on the bottom of the pan until you have an even layer. (I like to use the bottom of a measuring cup to press down.) : The aroma of chocolate from the crumbs will be prominent as you press them into an even layer, and you want a compact, uniform base to support the filling; a compacted crust yields a cleaner slice, whereas a loosely packed crust falls apart when sliced.
Bake at 350 degrees F for 15 minutes. Remove from oven and cool completely on a wire rack.: Baking the crust sets the fats so the base holds together, you will see a faint change in color and a toasted smell; allow it to cool fully so the filling does not melt the butter in the crust; a common mistake is adding filling to a hot crust which can cause separation and a soggy base.
TOAST COCONUT AND PECANS: Add coconut to one half of a large jelly roll pan and pecans to the other half. Bake for 12-15 minutes at 350 degrees F (you can bake with your crust), stirring occasionally, until coconut is golden and watching closely towards the end as coconut turns very quickly. Remove from oven and transfer pecans to cutting board. Once cool enough to handle, roughly chop pecans. Set aside.: Add coconut to one half of a large jelly roll pan and pecans to the other half. Bake for 12-15 minutes at 350 degrees F (you can bake with your crust), stirring occasionally, until coconut is golden and watching closely towards the end as coconut turns very quickly. Remove from oven and transfer pecans to cutting board. Once cool enough to handle, roughly chop pecans. Set aside. : Toasting releases oils and deepens flavor, you will smell a rich nutty perfume and see the coconut go from pale to golden, move quickly in the last minutes to avoid burning; chopped pecans should be fragrant and slightly crisp, and overtoasting will make them bitter so watch closely.
COCONUT PECAN FILLING: Meanwhile, whisk the egg yolks, evaporated milk and brown sugar together in a large saucepan. Add butter and cook over medium high heat until the sugar dissolves and the butter melts, stirring constantly. Bring to a gentle simmer then turn heat down to medium. Continue to cook, stirring constantly, until thick enough to coat the back of a spoon, approximately 8 minutes. Remove from heat and stir in vanilla, salt, chopped pecans and 1 1/2 cups coconut (save remaining 1/2 cup coconut for topping).: Meanwhile, whisk the egg yolks, evaporated milk and brown sugar together in a large saucepan. Add butter and cook over medium high heat until the sugar dissolves and the butter melts, stirring constantly. Bring to a gentle simmer then turn heat down to medium. Continue to cook, stirring constantly, until thick enough to coat the back of a spoon, approximately 8 minutes. Remove from heat and stir in vanilla, salt, chopped pecans and 1 1/2 cups coconut (save remaining 1/2 cup coconut for topping). : The filling will thicken and smell caramel like as the sugar dissolves; stirring constantly prevents curdling and creates a glossy custard that clings to a spoon; if the mixture curdles it usually means the heat was too high, so maintaining a gentle simmer and steady stirring is key.
WATER BATH: Fill a roasting pan with 1 1/4 inches water to create a water bath for your cheesecake (to prevent cracking). Place roasting pan in the oven to heat while you prepare your cheesecake filling.: Fill a roasting pan with 1 1/4 inches water to create a water bath for your cheesecake (to prevent cracking). Place roasting pan in the oven to heat while you prepare your cheesecake filling. : Heating the water first ensures the cheesecake goes into warm steam rather than cold water which could shock the cake, the steam will circulate and you will hear a soft hiss as the oven humidifies; failing to preheat the water bath can lead to uneven baking and cracks.
CHEESECAKE FILLING: Add German chocolate and semi-sweet chocolate to a medium bowl and microwave at 50% power at 30 second intervals, until completely melted, stirring after every 30 seconds. Set aside.: Add German chocolate and semi-sweet chocolate to a medium bowl and microwave at 50% power at 30 second intervals, until completely melted, stirring after every 30 seconds. Set aside. : Melting at reduced power prevents seizing and gives a glossy, smooth chocolate, you should stir until the chocolate is silky and warm but not hot; if chocolate overheats it can separate and grainy bits will remain, so go slow and patient.
Add cream cheese to the bowl of an electric mixer fitted with the paddle attachment and beat on medium speed until light and fluffy, about 4 minutes (no less!). Add sugar and beat 3 additional minutes.: Beating until light incorporates air that creates a silky texture; you will see the cream cheese go from dense to pale and airy, that lightness is essential for a tender outcome; underbeating leads to lumps and a denser cake, so give it the time specified.
Add cocoa powder and cinnamon and beat until combined. Add the sour cream and vanilla and beat just until blended. Add the eggs, then the egg yolk, 1 at a time, beating as little as possible, just until combined after each addition. Stir in melted chocolate with a spatula just until combined.: The batter will smell richly of chocolate and cinnamon, and folding in eggs gently maintains the aeration you created earlier, overbeating after adding eggs can trap air and cause cracking, so mix only until the streaks disappear and the batter is homogeneous.
ASSEMBLE: Transfer about half of the cheesecake batter to the cooled crust and smooth into an even layer. Spoon about two-thirds of the Coconut Pecan Filling evenly over cheesecake and smooth. Top with remaining cheesecake and smooth. Drop pan on the counter a few times to get rid of any air bubbles. Refrigerate remaining 1/3 Coconut Pecan Filling for later.: Transfer about half of the cheesecake batter to the cooled crust and smooth into an even layer. Spoon about two-thirds of the Coconut Pecan Filling evenly over cheesecake and smooth. Top with remaining cheesecake and smooth. Drop pan on the counter a few times to get rid of any air bubbles. Refrigerate remaining 1/3 Coconut Pecan Filling for later. : When layered you will notice visual strata and the batter will feel dense yet creamy as you smooth it, dropping the pan releases trapped air which prevents large holes in the final bake; avoid overfilling the pan, leave space at the top for expansion which keeps edges from oozing over.
BAKE: Add cheesecake to water bath and bake at 350 degrees F for 60-75 minutes OR until edges are firm and the center 2-3 inches of the cheesecake is still wobbly. (DON’T open door before 60 minutes, this can cause cracks.): Add cheesecake to water bath and bake at 350 degrees F for 60 to 75 minutes OR until edges are firm and the center 2 to 3 inches of the cheesecake is still wobbly. (DON’T open door before 60 minutes, this can cause cracks.) : The smell of baking chocolate and caramel will fill your kitchen, and the visual cue is a set outer rim with a gentle tremble in the center, that wobble will set during the cool down into a creamy texture; opening the oven too soon causes temperature shock and cracks so resist the urge to peek.
COOL: Turn off your oven and crack open the oven door. Allow cheesecake to cool in oven for 60 minutes, then remove to a wire rack and gently run a hot knife along the edges of the cheesecake (to prevent cracking) then continue to cool for 2-3 hours or until cheesecake is completely cooled. Cover the top of the cheesecake with foil, so that it doesn't actually touch the cheesecake. Chill in the refrigerator overnight but best if 24 hours.: Turn off your oven and crack open the oven door. Allow cheesecake to cool in oven for 60 minutes, then remove to a wire rack and gently run a hot knife along the edges of the cheesecake (to prevent cracking) then continue to cool for 2 to 3 hours or until cheesecake is completely cooled. Cover the top of the cheesecake with foil, so that it doesn't actually touch the cheesecake. Chill in the refrigerator overnight but best if 24 hours. : Cooling slowly lets the custard set without contracting harshly, you will notice condensation subside and the texture firm without a hard center, running a hot knife helps separate the cake gently from the pan, and chilling overnight ensures clean slices; rushing the chill can give a loose center and messy slices.
GARNISH: Remove cheesecake to serving platter. Stir in 1 tablespoon water to Coconut Pecan Filling (now topping) and microwave approximately 30 seconds, or until softened. Spread over cheesecake and top with reserved coconut. The cheesecake can be refrigerated again at this point or served.: Remove cheesecake to serving platter. Stir in 1 tablespoon water to Coconut Pecan Filling (now topping) and microwave approximately 30 seconds, or until softened. Spread over cheesecake and top with reserved coconut. The cheesecake can be refrigerated again at this point or served. : Warming the topping brings it to a spreadable glossy consistency and the aroma of toasted coconut will bloom, spread carefully to keep edges neat; if the topping is too hot it may drip, so heat only until pliable and cool slightly before topping.
CHOCOLATE DRIZZLE (optional): Just before serving, add chocolate and 1/2 teaspoon shortening to a small microwave safe bowl. Microwave at 30 second intervals, until completely smooth, stirring after every 30 seconds. Add chocolate to a small plastic bag and snip one corner. Drizzle chocolate all over cheesecake.: Just before serving, add chocolate and 1/2 teaspoon shortening to a small microwave safe bowl. Microwave at 30 second intervals, until completely smooth, stirring after every 30 seconds. Add chocolate to a small plastic bag and snip one corner. Drizzle chocolate all over cheesecake. : The drizzle adds visual polish and a final chocolate note, the chocolate should be glossy and fluid as you pipe thin ribbons over the top, let the drizzle set briefly before slicing; if the chocolate thickens too much it will clump, so keep it warm and fluid while you work.