Ingredients:
1 pound ground beef (or substitute with ground turkey or chicken)
1 medium onion, chopped
1 package (1.25 ounces) taco seasoning mix
1 cup shredded cheddar cheese
1/2 cup Bisquick baking mix
1 cup milk
2 eggs
1 medium tomato, chopped
1/4 cup chopped green onions
1/2 cup chopped bell pepper (optional)
Shredded lettuce, sour cream, salsa (for serving)