Preheat oven to 350 degrees F and spray all surfaces of a 12 cup nonstick bundt pan with nonstick cooking spray with flour or grease and flour the inside of your pan. Set aside.: As the oven warms, you will smell the faint dry heat that signals even baking ahead, which calms nerves. Properly preparing your bundt pan is critical because the cake needs to release cleanly; the light dusting of flour on the greased surface creates a barrier so the cake edge will retract and unmold without tearing. A common error is skimping on greasing in the intricate bundt ridges, leading to a stuck cake; take extra care to get into grooves with a pastry brush if needed. If you notice any excess pooled oil, blot it so the coating stays even. Visual cues include a smooth, even sheen of oil and a light, powdery coating of flour without clumps.
In a small bowl, whisk lemon juice into room temperature eggnog. Set aside.: When you combine the lemon juice and room temperature eggnog , you may observe a subtle thickening as the acid reacts, which contributes a gentle tang and reacts with the baking soda to help the cake rise. This small chemical interaction uplifts the crumb and brightens the richness of the dairy. Avoid using cold ingredients here so the mixture stays emulsified; cold can create small lumps or cause the butter to seize later. The mixture should look slightly curdled or thickened, not separated, which is normal.
Whisk flour, baking powder, baking soda, nutmeg, cinnamon and salt together in a medium bowl. Set aside.: As you whisk the dry mix, you will notice the warm scents of nutmeg and cinnamon blooming into the air, a tiny preview of the cake aroma. Even distribution of leaveners and spices ensures consistent rise and flavor in every bite. A typical mistake is adding the leaveners directly to wet batter, which can cause uneven pockets of rise; pre-mixing avoids that. The dry mix should look uniform, with no streaks of baking powder or soda visible, which indicates proper mixing.
Add butter and sugar to a stand mixer fitted with the paddle attachment and beat on medium-high speed for at least 3-4 minutes (no shorter!), until light and fluffy, scraping down sides occasionally. Reduce speed to medium and add eggs, one at a time, beating just until the yellow disappears after each egg. Beat in vanilla just until combined.: Creaming butter and sugar that long forces the mixture to become pale and aerated; you will see the texture change from glossy to pillowy, and you will hear the mixer hum differently as air is incorporated. Those air pockets expand in the oven, making for a taller, lighter cake. When adding eggs , watch the batter go from thick to silkier; stop when the yellow streaks vanish to avoid overbeating which can cause collapse. If you overbeat at this stage, the batter may become too loose and the cake can sink; scrape the bowl well to ensure even incorporation.
Reduce speed to low and gradually add flour mixture to butter mixture in thirds, alternately with eggnog in between each third. Beat until just combined, giving the batter a final stir by hand to get any flour at the bottom.: The rhythm of alternation keeps the batter smooth while minimizing gluten development; I love how this produces a tender crumb with a velvety mouthfeel. You should notice the batter thicken and then loosen slightly after each addition of eggnog , with no dry streaks left. Avoid overmixing, which makes the crumb tough. A common oversight is dumping everything in at once; that can create clumps and cause uneven texture. Finish by folding gently with a spatula so the batter looks homogenous and glossy.
Transfer batter to prepared bundt pan and tap pan on the counter a few times to get rid of any air bubbles.: When you pour the batter, it should flow slowly and fill the pan evenly, with a satiny surface. Tapping releases trapped air pockets which, if left, can create large holes in the crumb. Listen for a dull thud as the batter settles, and you may see tiny bubbles rise and pop. Avoid shaking the pan too vigorously because that can create waves; gentle taps are enough. If you spot big bubbles on top, smooth them with a spatula before baking.
Bake at 350 degrees F until a wood pick inserted near the center of cake comes out with a few crumbs, 45 – 55 minutes (darker pans will require closer to 40-45 minutes).: As the cake bakes, the scent of spices will intensify and the top will take on a golden hue. The edges will begin to pull away slightly and the cake will feel springy when gently pressed. Using a skewer ensures doneness without overbaking; you want a few moist crumbs, not wet batter. Opening the oven often can cause the cake to fall, so resist peeking until the final minutes. If the top browns too quickly, tent with foil to prevent overcoloring while the center finishes baking.
Let cake cool in pan for 15 minutes then remove from pan to a wire rack to cool completely before frosting. If not frosting immediately, then tightly wrap cooled cake in plastic wrap.: The resting period allows the cake to retract slightly from the pan, making unmolding safer and cleaner. You will notice steam gently escaping and the cake settling into a stable shape. If you try to unmold too soon, it can break or stick; if left too long, condensation can make the exterior damp. Once on the wire rack, the cake cools evenly; a warm cake plus cold frosting can melt the frosting, so ensure it is fully cool before applying.
Beat cream cheese, butter and 2 tablespoons eggnog together until smooth. Gradually beat in powdered sugar, adding additional eggnog if necessary, to reach desired consistency. Beat in cinnamon and nutmeg. (Thick frosting is like the pictured piped frosting and thinner will be more like a glaze – totally personal preference.): The frosting should be silky and luminous when properly whipped, and you will smell the warm spices rising through the sweet tang of cream cheese . Start with softened components so the mixer produces a smooth texture rather than lumps. Add powdered sugar gradually to control thickness; too much at once can create a dust cloud and an overly stiff frosting. If the frosting becomes too thin from extra eggnog , chill briefly to firm it up before piping. Taste as you go and adjust spice balance to preference.
Pipe or drizzle desired amount of frosting over cake and serve any remaining frosting with individual servings. I love to warm my cake with glaze in the microwave for 10 seconds or so – so good!: Piping creates defined ridges and pretty swirls, while a drizzle settles into crevices, offering contrasting textures. If you warm slices slightly, the frosting will soften and meld into the cake for a cozy mouthfeel; just a few seconds is enough. Avoid overheating slices as the frosting can melt away completely. For even coverage, start at the center and let the frosting move outward, watching how it falls into the bundt valleys.
Store frosted cake in the refrigerator and bring to room temperature before serving.: Chilling helps the frosting set and extends freshness, and bringing the cake back to room temperature just before serving restores the best texture and flavor. You will notice the spices and butter flavors bloom as the cake warms. Leaving the cake at room temperature too long risks softening the frosting excessively, while leaving it refrigerated too long can mute flavors; aim for about 20 to 30 minutes at room temp for best results.