In a large nonstick skillet cook sausage over medium heat about 5 minutes or until brown, using a wooden spoon to break up meat as it cooks. Drain off fat. Add tortillas, red sweet pepper, onion, and green chile peppers and cook about 5 minutes or until onion is tender. Add egg and cook, without stirring, until egg begins to set on bottom and around edges. With a spatula or large spoon, lift and fold the partially cooked egg so the uncooked portion flows underneath. Cook for 2 to 3 minutes or until egg is cooked through but is still glossy and moist. Fold in cheese and 1/2 cup salsa. Immediately remove from heat.
Serve migas with avocado, sour cream and additional salsa.