Banana Walnut Upside Down Cake

1/4 cup unsalted butter

3 tablespoons pure maple syrup

1/4 cup walnuts -- coarsely chopped

4 large ripe bananas, peeled & cut diagonally --

1/4 inch slices Cake

1 cup flour

2 teaspoons baking powder

1/2 teaspoon cinnamon

1/4 teaspoon salt

3/4 cup sugar

6 tablespoons unsalted butter -- room temperature

1 large egg

1/2 teaspoon vanilla

6 tablespoons milk sweetened whipped cream -- optional For topping: Preheat oven to

325. Combine sugar and butter in heavy medium saucepan; stir over low heat until butter melts and mixture is well blended. Pour into a

9" diameter cake pan with

2" high sides. Spread to coat bottom of pan. Pour maple syrup over sugar mixture. Sprinkle nuts evenly over. Place banana slices in concentric circles on nuts, overlapping slightly and covering bottom. For cake: Stir flour, baking powder, cinnamon and salt in medium bowl to blend. Beat sugar and butter in another medium bowl until creamy. Add egg and vanilla; beat until light and fluffy. Beat in flour mixture alternately with milk in

3 additions. Spoon batter over bananas. Bake until tester inserted into center of cake comes out clean, about 55 minutes.