Chopped green onions -to garnish top Combine first three ingredients. Combine milk, egg and chilies in a separate bowl. Saute' chopped onion in oil and add to milk mixture; stir into cornmeal mixture, then pour half of batter into the bottom of an oiled casserole dish (rectangular). Layer with beans, tomato sauce, and cheese; repeat layering. Bake at 190ºC . for 40 minutes, garnish with chopped green onions and serve with salsa.