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Heat oven to 350°F.
Microwave chocolate and butter in large microwaveable bowl on HIGH 2 min. or until butter is melted. Stir until chocolate is completely melted and mixture is well blended. Add sugar; mix well. Blend in bananas, eggs and vanilla. Stir in flour.
Pour into 13x9-inch pan sprayed with cooking spray.
Bake 23 to 25 min. or until toothpick inserted in centre comes out with fudgy crumbs (Do not overbake.) Cool completely.