HEAT oven to 350°F. Place butter in 13 x 9-inch baking pan. Heat in oven until melted. Sprinkle with brown sugar
DRAIN pineapple, reserving juice. Add water to juice to make 2 cups. Set mixture aside. Cut pineapple slices in half. Arrange slices on top of brown sugar, in 3 rows of 6, placing a half cherry in front of each slice. Combine reserved juice mixture, pancake mix, sugar, vanilla and oil in medium bowl. Mix until smooth. Pour over fruit in pan
BAKE 33 to 37 minutes or until toothpick inserted in center comes out clean. Cool 5 minutes. Invert cake onto serving plate. Serve warm with whipped cream, if desired.