To bake this Cake, we need a ten-cup tube pan. Grease the pan with butter or oil spray, and sprinkle some almond flour.
Preheat the oven to 350℉.
Use the whisk attachment to whisk together the room-temperature butter and sugar for 3-4 minutes until it is light and fluffy.
1 cup Butter, 2 cups Granulated sugar
Add the room-temperature sour cream and vanilla extract and mix well.
1 tablespoon Sour cream, 1 tablespoon Vanilla extract
Whisk the all-purpose Flour, baking powder, and almond Flour in a separate bowl. Add the dry ingredients alternating with the room-temperature milk, gently mixing after each addition. Start and finish with dry ingredients. The batter will be pretty thick. Set this mixture aside.
3 cups All-purpose flour, 1 tablespoon Baking powder, 1 cup Almond flour, 1 cup Milk
Wipe the bowl and the whisk attachment with white vinegar to remove any fat residue.
Add the egg whites and salt to the bowl and whisk on high speed until stiff peaks form.
6 Egg whites, ½ teaspoon Salt
Add one-quarter of the whipped whites to the batter and gently fold. Add the remaining egg whites to the batter and gently fold. Avoid mixing vigorously. The batter starts to loosen and become less stiff.
Once all the egg whites are incorporated, it will be pourable. Pour the batter into the prepared pan and smooth out the surface of the batter. Bake the Cake for 50-60 minutes or until it is golden.
Let the Cake cool down in the pan for 15 minutes, then flip it onto the cooling rack. Let the Cake cool down entirely, then dust its top with powdered sugar.
¼ cup Powdered sugar