Preheat oven to 350 degrees. Cook sausage on stove according to package directions; cut into small pieces and set aside.
Coat muffin pan and both sides of tortillas with cooking spray. Cut tortillas into quarters.
Arrange three tortilla pieces in each muffin cup, overlapping to fit. Press tortillas gently and firmly into muffin pan. (Tortillas should stick up higher than muffin cup sides.)
Arrange half of the cheese in tortilla-lined muffin cups. Top with sausage and the remaining cheese.
In a bowl, combine the eggs, milk, bell pepper, cilantro, salt and pepper. Carefully pour into cups. Bake for 18-20 minutes or until eggs are set.
Serve with salsa if desired.