1. Heat oven to 350°F.
2. Melt butter in medium saucepan over low heat. Add cocoa; stir until smooth. Remove from heat. Stir together eggs, milk and vanilla. Add egg mixture to cocoa mixture; stir with whisk until smooth and slightly thickened. Add brown sugar, granulated sugar, flour and salt to cocoa mixture; stir with whisk until smooth. Pour mixture into unbaked crust.
3. Bake 30 to 35 minutes until edges are set (center will be soft). Cool about 2 hours. Just before serving, garnish each serving with banana slices, ice cream and whipped topping. Makes 8 servings.