Ingredients

• 1 lb lean ground beef
• 1 medium onion, chopped (1/2 cup)
• 1 (16 ounce) can tomato sauce
• 1 (15 1/4 ounce) can green giant whole kernel corn
• 2 cups shredded cheddar cheese (8 ounces) or 2 cups processed American cheese (8 ounces)
• 2 cups original Bisquick baking mix
• 1 cup milk
• 2 eggs
• sour cream
• shredded lettuce
• 1 (1 ounce) package old el paso taco seasoning mix
• chopped tomato