2 pounds ground beef, cooked and drained
1 (1.25-ounce) packet taco seasoning
4 ounces sour cream
4 ounces mayonnaise
8 ounces Cheddar cheese, shredded and divided
1 yellow onion, sliced
2 cups biscuit mix
2 tomatoes, sliced
1 green bell pepper, sliced
1 (4-ounce) can sliced jalapeno peppers