Preheat oven to 350 degrees F. Generously butter a standard (12-cup) bundt pan, making sure to get in all the nooks and crannies. Dust with flour, tapping out any excess.: As the oven warms, you will notice a faint metallic hum from the heating elements and the temperature dial reaching its mark. The sound of butter creaking as you press it into the pan and the soft rustle of flour dusting the grooves signal careful preparation. This step ensures the cake releases smoothly, preserving the sculpted ridges that make a bundt special. If you skip thorough greasing, the cake can cling and tear when inverted, so take your time to coat every indentation. The aroma of the oven preheating is a subtle cue that the kitchen is ready for the batter, and the even dusting of flour should appear as a thin, uniform veil after you tap out the excess. Troubleshoot any sticking by revisiting the buttered corners and making sure pockets are not missed.
In a bowl, sift together flour, baking powder, baking soda, salt, cinnamon, nutmeg, and cloves.: The sifted mixture will smell faintly of spice, with the cinnamon leading and cloves offering a sharp whisper. Sifting aerates the dry components so the leaveners distribute evenly, preventing dense pockets and promoting a fine crumb. The visual cue is a lighter, more powdery texture and the fragrant blend floating up when you lift the sifter. If the mixture looks lumpy, press it through again, because lumps of baking powder or soda can create odd tunnels or uneven rise. This step matters because even dispersion of the leavening agents is key to an even dome and tender interior.
In a large mixing bowl or the bowl of a stand mixer, beat sugar and butter until fluffy, 1 to 2 minutes. Add eggs, one at a time, mixing well after each addition. Scrape down the sides of the bowl, then mix in pumpkin and vanilla. Add dry ingredients in three additions, alternating with milk, mixing until incorporated. Fold in chocolate chips.: When you cream sugar and butter , listen for a softer, lighter sound as the mixture aerates; it should lighten in color and hold a faint ribbon when lifted. Adding eggs slowly allows the emulsion to form, and your batter should appear smooth after each incorporation. The first swirl of pumpkin will release a warm, earthy scent, while vanilla lifts the sweetness. Alternating dry ingredients with milk yields a batter that is neither too stiff nor too runny, providing the correct viscosity for a bundt. Folding in the floured mini semisweet chocolate chips should be gentle, using a spatula to preserve some air and ensure the chips stay suspended. Avoid over mixing at this stage because that will develop gluten and tighten the crumb. If you hear a slurry or see separation, stop and scrape well, because overbeating is the most common mistake that leads to a denser cake.
Pour batter evenly into prepared pan. Bake for 50 to 55 minutes or until a toothpick inserted in the deepest part of the pan comes out clean or with a few moist crumbs attached. Move to a wire rack and let cool; invert onto wire rack, cake should come out cleanly.: As the cake bakes, you will notice the kitchen filling with the scent of pumpkin and spice while the top develops a warm, golden tone. The sound inside the oven is subtle, but you may hear gentle settling as steam escapes. Use a toothpick in the deepest channel to check doneness, aiming for mostly clean with a few moist crumbs, which avoids over baking. Letting the cake rest briefly allows the crumb to stabilize; rushing the inversion can cause breakage. If the cake seems to stick, gently run a thin spatula along the inner rim before turning it out. A common mistake is removing the cake while it is still too warm, resulting in a torn silhouette, so trust the cool down period until it feels set but not cold.
To prepare glaze, heat all ingredients in a small saucepan over medium-low heat until melted and smooth. If necessary, add more milk or cream, 1 tablespoon at a time, until glaze is the consistency of maple syrup. Place wire rack with cake inside a sheet pan or cookie sheet. Pour glaze evenly over cake, letting it drip down and completely cover the top and sides, using a spatula if necessary to cover any missed spots. Let sit for 30 minutes to allow glaze to set. Slice and serve. Leftover cake will keep in an airtight container for up to 3 days.: As the dark chocolate , unsalted butter , heavy cream , whole milk , and corn syrup melt together, expect a glossy, velvety mixture that gives off a deep cocoa perfume. Stir gently, and reduce heat if you notice any smoking or separation, because high heat can cause the chocolate to seize. The ideal glaze drips slowly like warm syrup and clings to the ridges as it cools. Pouring over a rack set in a sheet pan catches drips and creates an even finish. The glaze should set to a soft sheen after about 30 minutes, and slicing too soon can result in a smeared surface. If the glaze is too thick, whisk in a tablespoon of milk or cream to loosen it; if it is too thin, let it cool slightly to thicken. A common pitfall is overheating the glaze which dulls the shine, so keep heat gentle and steady.