Preheat oven to 350(F).

Pour melted butter into an 8-inch square baking pan coated with cooking spray; sprinkle with brown sugar. Bake at 350(F) for 2 minutes. Remove from oven, and top with pecans and cranberries.

Lightly spoon flour into dry measuring cups; level with knife. Combine flour, baking powder, and salt in a bowl; stir with whisk.

Place sugar and butter in a large bowl; beat with a mixer at medium speed until well blended. Add egg yolks, 1 at a time, beating well after each addition. Stir in vanilla.

Add flour mixture and milk alternately to butter mixture, beginning and ending with flour mixture; mix after each addition. Beat the egg whites with a mixer at high speed until stiff peaks form using clean, dry beaters; fold into batter.

Spread batter over cranberries. Bake at 350(F) for 45 minutes. Cool in pan for 5 minutes on a wire rack. Loosen edges of cake with a sharp knife. Place a plate upside down on top of cake pan; invert onto plate.