Add 1 tbsp. olive oil to preheated skillet and soften the onion for about 3 minutes
Add meat and green pepper and cook until meat is lightly browned and vegetables are tender.
Turn off the heat and add the cheese stirring until melted. Turn into a 9x9x2-inch baking dish.
When there's about 5 minutes left on the filling, stir the cornmeal and 1/2 tsp salt into cold water. Cook stirring constantly over medium heat until thick.
Add butter and mix well. Spoon over the filling.
Bake at 375 degrees for about 40 minutes.