Low Fat Mexicali Beef Pie

Preheat oven to 350 degrees. Coat the inside of a 10x10 inch baking dish with cooking spray. Combine ground beef and onions in a large skillet. Cook over medium high heat, breaking up clumps, until beef is browned. Drain beef and spread evenly in the prepared dish. Sprinkle the diced green chilies over the beef. Sift together flour and baking powder into a large bowl. Cut in margarine until coarse crumbs form. Add milk and eggs and whisk until batter is smooth. Pour the batter over the beef. Bake about 35 to 40 minutes until top is puffed and lightly browned. Sprinkle with the Monterey Jack and bake an additional 5 minutes. Let pie stand 5 minutes before cutting into squares. Garnish each slice with some of the lettuce and tomatoes. Serve immediately with salsa.