Put in a saucepan cornmeal, salt, and water. Add gradually Pet milk. Boil and stir until mixture thickens. Cover and let cool. Preheat oven to 375 degrees. Grease a shallow 9 X 13-inch baking pan.
Brown meat and onion cook until almost done. Drain off excess fat, and add tomatoes, salt and pepper to taste and chili powder. Stir and cook until done. Spread 1/2 cornmeal in dish then add meat mixture. Top with remaining cornmeal. Bake until the top is light brown for about 35 minutes.