Heat butter in large skillet.
Add onions, bell peppers, garlic, taco seasoning, black beans, salsa, and tasso.
Mix well. Season to taste.
Spread ½ of mixture in greased 9x5 pan.
Put 1 cup cheese over mixture.
Layer balance of mixture and top with remaining cheese.
Add olives, jalapenos, etc, over mixture.
Bake at 360 degrees until cheese is melted & gooey (about 20 minutes).
Serve with crackers, tortilla chips, or large corn chips.