Preheat oven to 350°F. Sift together flour, baking powder and salt. Set aside. Cream butter and sugar together until light and fluffy. Add eggs, vanilla and mint extracts to butter mixture. Add flour mixture alternately with milk, beating well after each addition. Continue beating one minute. Pour into prepared pan. Bake 20-25 minutes or until toothpick inserted comes out clean. Cool 10 minutes in pan on rack; remove and cool completely before decorating.