1/2 stick butter
1 c. brown sugar
large can crushed pineapple
box butter cake mix (I use Duncan Hines)

Melt butter and beat in brown sugar. Grease bottom of long cake pan with squeeze butter. Pour large can of crushed pineapple with juice and the previous mixture into bottom of cake pan. Mix butter cake mix as directed and pour over mixture.

Bake at 350°F for 45 to 50 minutes. Turn over onto a long cookie sheet (so that pineapple is on top) shortly after taking out of oven. Serve while warm.