Banana Chocolate Chip Dessert

3/4 c butter
2/3 c white sugar
2/3 c brown sugar
1 egg, beaten
1 t vanilla
1 c mashed bananas
1 3/4 c all-purpose flour (I used 1 c white, 3/4 c wheat)
2 t baking powder
1/2 t salt
1 c semisweet chocolate chips

Preheat oven to 350°.  Grease and flour 10x15" jelly roll pan (I use pampered chef rectangle stone)

In large bowl, cream butter and sugars until fluffy.  Beat in egg and vanilla.  Fold in mashed banana.  In separate bowl, mix flour, baking powder and salt.  Fold flour mixture into butter mixture.  Stir in chocolate chips.  Spread in prepared pan.

Bake in preheated oven 20 minutes, until set.  Cool before cutting into squares.