In the bowl of a stand mixer, add the flour, sugar, cocoa, baking soda, baking powder, and salt. Mix them just until evenly combined.
2 1/4 cups flour, 1 1/4 cup sugar, 3/4 cup unsweetened cocoa powder, 1 1/2 tsp baking soda, 1 tsp baking powder, 1/2 tsp salt
In a small bowl, whisk together the milk and malt powder until completely combined.
1 cup milk, 1 cup malted milk powder
Mixing on medium, slowly pour in the milk mixture until evenly combined. Mix in the eggs and oil, just until the mixture's smooth.
1 cup canola oil, 3 large eggs
Mix in the sour cream and vanilla extract, just until the mixture's once again smooth.
1 cup sour cream, 1 tsp vanilla extract
Grease & flour 2-3 9" cake pans, depending on your desired thickness/number of layers. Pour the cake batter evenly into the prepared pans. Pat the pans down on a flat surface to remove any air bubbles. Bake the cakes at 350 for 20-25 minutes, or until a toothpick inserted in the center of each comes out clean.
Let the cakes rest in the pans for 10 minutes. Run a butter knife around the edges of the pan to ensure the cake has 'released'. Flip the cakes out over wired racks and let them cool completely.