Step 1: How to make Banana Brownie Cake:
Step 2: – Preheat oven to 350 degrees F. Apply a coat of vegetable oil on a baking pan and dust it with flour.
Step 3: – In a bowl, make a batter out of flour, milk powder, salt and baking powder. In a blender or food processor, make a smooth puree of the banana, sugar, egg whites, vanilla essence and buttermilk.
Step 4: – Add the dry mixture of flour, milk powder and others to this batter and whip just until blended. Pour into the greased and dusted pan.
Step 5: – Bake until the cake passes the wooden pin or toothpick test. Cool it on a wire rack or tray.