1/4 c. butter
1/2 c. packed brown sugar
1 (20 oz.) can crushed pineapple, drained
1 pkg. Betty Crocker Supermoist carrot cake mix

Heat oven to 350 degrees. Heat butter in rectangular pan, 13 x 9 x 2 inches, in oven until melted. Sprinkle with brown sugar. Spoon pineapple over brown sugar; spread evenly.

Prepare cake mix as directed on package. Pour over pineapple. Bake 35 to 40 minutes or until cake pulls away from sides of pan and springs back when touched lightly in center. Cool 10 minutes. Invert onto heatproof serving platter; remove pan. Cool cake completely. Serve with sweetened whipped cream if desired.