Preheat oven to 325°F. Prepare a 10-inch bundt pan by spraying with a nonstick baking spray. Set aside.
In a small bowl, whisk together the flour, cocoa powder, baking powder, and salt. Set aside.
2 cups all-purpose flour, ¾ cup unsweetened cocoa powder, ½ teaspoon baking powder, 1 teaspoon kosher salt
In a larger bowl, using a hand mixer, beat together the butter and sugar for 5 minutes. Add in the eggs, 1 at a time, beating well after each addition. Mix in the vanilla. Pour half of the flour mixture into the wet ingredients and mix until just combined. Mix in the sour cream, then mix in the remaining flour mixture until well combined.
1½ cups unsalted butter, 3 cups granulated sugar, 5 large eggs, 2 teaspoons pure vanilla extract, 1 cup sour cream
Pour the batter into the prepared bundt pan and bake for 80 minutes. Test for doneness by inserting a toothpick into the center of the cake and comes out clean. Allow the cake to cool for 10 minutes before inverting the cake onto a cooling rack. Cool completely before pouring the glaze.
For the Fudge Glaze
In a microwave-safe bowl, combine all of the glaze ingredients. Cook in the microwave for 30 seconds, take the bowl out, and stir. If there are lumps still remaining, cook for another 10 seconds. Stir everything until well combined.
This glaze does not get hard. It’s more of a creamy fudge frosting after it’s set and pours on like a glaze.
Do NOT over mix your cake batter! When mixing, you're creating air in your batter, which will help your cake rise in the oven. If you mix it too much, this air goes away and your cake won't rise properly.
Double-check that the pound cake is done before letting it cool off on a cooling rack. You can do this easily by inserting a clean toothpick into the center of the cake. If it comes out clean, the cake is baked.
Want to add more sweetness? Sprinkle some powdered sugar on top to satisfy your sweet tooth even more!
Storage: Store chocolate pound cake in an airtight container at room temperature for up to 2 days or in the refrigerator for up to 4 days.