Pour lemon juice over mangoes and let stand 15 minutes.
Melt 1 tablespoon butter in 8 inch cake pan or casserole. (Do not use iron skillet as mangoes will darken.)
Add brown sugar and cover with mango slices.
To prepare cake batter, cream butter; add sugar and cream; add beaten egg.
Sift dry ingredients and add alternately with milk; pour over mangoes and bake 50 to 60 minutes at 375.
When cake is done, turn upside down and serve while warm.