Instructions: In a medium bowl, stir together flour, baking powder, baking soda and salt; set aside. In a large mixer bowl, combine sugar and butter, and beat at medium speed, scraping bowl often, until mixture is creamy. Add eggs, one at a time, beating after each addition. Add bananas, sour cream and vanilla, and beat until well mixed. Continue beating, gradually adding flour mixture and scraping bowl often until well mixed, about 1 minute. By hand, stir in 1 cup chocolate chips. Pour batter into a greased 9x13 inch pan. Sprinkle remaining chips over batter. Bake in a preheated 350 degree oven for 40 to 50 minutes, or until a toothpick inserted in center comes out clean.

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