Preheat oven to 350F.
Add 1/4 c margarine to cake pan or cast iron and place on center rack of oven.
While melting, prepare fruit by peeling, pitting and slicing if necessary.
Once margarine is melted, BUT NOT BROWNED, remove from oven.
Add brown sugar to the pan and stir until combined.
Even the mixture at the bottom of the pan.
Top the mixture in the pan with the prepared fruit.
Set aside.
In a mixing bowl, combine flour, baking powder, salt, cinnamon and nutmeg.
In a stand mixer, mix softened margarine on medium speed for 30 seconds.
Beat in sugar until well mixed.
Add egg and then vanilla until smooth and combined.
Finally, alternate adding the flour mixture and the milk until everything is combined.
Spread batter evenly over fruit in pan/skillet.
Bake for 45-50 minutes or until a toothpick comes out clean.
Let cool in pan for 15 minutes before turning upside down onto serving platter.
Serve warm and/ a la mode!