Brown meats and soften onion and set aside while next group of ingredients are assembled.
In large casserole or 9 by 13 inch baking pan, combine together peas, corn, cheese - which has been cubed or melted, - evaporated milk (don't forget to reserve 1/2 cup)and worcestershire sauce. Add the browned meats and onion and mix together thoroughly. You may want to add some salt and pepper at this point, it depends on how salty and seasoned your sausage and cheese is, and, of course, your own taste.
Place dish in preheated 400 degree F oven and bake while mixing the batter (about 10 minutes). Remove pan from oven and pour the batter over the dish being sure to cover the sides and corners well. Leave an open area in the center. Not only does that make for a nicer presentation, it allows steam to escape without breaking through your crust.
Continue baking at 400 degrees for 20 more minutes. Cool slightly, cut into squares and serve.