Preheat the oven. Preheat your oven to 350°F (175°C).
Combine the wet ingredients + cocoa powder. Whisk together the coffee, vegetable oil, cocoa powder, vanilla, eggs, and sour cream in a separate bowl.
Combine the dry ingredients. Whisk together the granulated sugar, baking powder, baking soda, salt, and flour in a separate bowl.
Combine the wet and dry mixtures. Slowly add the dry ingredients to the wet ingredients, stirring until well combined. Scrape down the bowl’s sides and bottom to make sure all ingredients are fully incorporated.
Prepare the pan. Thoroughly grease a 10-12 cup Bundt pan to prevent sticking.
Bake. Pour the batter evenly into the greased Bundt pan. Bake for 50 to 55 minutes or until a long toothpick inserted into the center comes clean. If using a dark-colored pan, start checking for doneness at 40 minutes.
Cool the cake. Remove it from the oven and let it cool in the pan for 5 minutes. Invert the pan onto a wire rack, lift off the pan, and let the cake cool completely on the rack.