Heat the oven to 350 degrees F. Lightly grease or spray with nonstick cooking spray the bottom and sides of a 9-inch spring-form pan.

Combine the flour, baking powder and salt in a medium bowl.

Beat the whites in a mixer bowl with the whisk attachment until foamy. Gradually beat in the sugar and continue beating until stiff peaks form, about 5 minutes. Place in another bowl.

Whip the egg yolks in the mixer bowl with the whisk attachment until they are light and lemon colored, about 4 minutes. Fold the egg whites into the egg yolks, using a light touch.

Gently fold in the flour mixture in 4 batches. Fold in the butter and almond extract. Pour into the prepared spring-form pan.

Bake 22 to 25 minutes or until cake springs back when lightly touched in the center and begins to pull away from the sides of the pan. Remove from the oven. Heat broiler to high.

While the cake is baking, combine the sugar and flour for the topping in a small saucepan. Add the butter and milk and cook over low heat, stirring constantly, until thickened, 1 to 2 minutes. Stir in the almonds and almond and vanilla extracts.

Pour the topping over the cake and place under the broiler. Broil until the topping is brown, about 1 to 2 minutes.

Cool on a wire cooling rack 5 minutes. Run a metal spatula around the side of the pan to loosen. Remove the side of the pan. Cool completely.