Baked Chili Casserole

1 pound ground beef

1/4 cup chopped onion

1 tablespoon chili powder

1 tablespoon Bisquick baking mix

3 tablespoons water

1 can (14-1/2 ounce size) whole tomatoes, undrained

1 can (15-1/4 ounce size) whole kernel corn, drained

3/4 cup Bisquick baking mix

1 teaspoon salt

3/4 cup yellow cornmeal

2/3 cup milk

1 egg

Heat oven to 350 F. Cook beef and onion in 2-quart saucepan, stirring frequently, until beef is brown and onion is tender; drain. Mix chili powder, 1 tablespoon baking mix and the water; add to beef mixture. Stir in tomatoes, corn and salt; break up tomatoes. Heat to boiling, stirring frequently. Pour into ungreased square baking dish, 8x8x2 inches, or 2-quart casserole. Stir remaining ingredients until blended; pour over beef mixture. Bake uncovered 35 to 40 minutes or until golden brown.