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First preheat your oven to 375 degrees & spray your square pan with cooking spray.
Whisk together the flour, baking powder, & salt. Set aside.
In a stand mixer, beat the butter, oil, sugar. Beat in the eggs and egg whites one at a time, allowing time after each egg. Mix in vanilla.
In a separate bowl, mash the bananas with milk & set aside.
Your milk & banana mixture should look similar to this.
Gradually add half of the dry ingredients into the butter mixture. Mix in bananas. Mix in remaining dry mixture. Pour mixture into 8x8 square greased pan.
Next place in middle oven rack for 40-45 minutes or until toothpick comes out clean. Cool cake in the pan on a wire rack.
Using electric mixer on medium speed, beat the cream cheese & vanilla. Reduce the speed & gradually add powdered sugar.
Spread frosting on the cake & sprinkle with nuts. Enjoy!!