In a large skillet over medium heat brown sausage with onion until no longer pink. Drain and set aside, leaving mixture in skillet.
In a medium bowl beat together eggs and chiles. Add to sausage mixture; cook over medium heat, stirring occasionally, until eggs are set. Add cheese, mixing well to melt.
Warm flour tortillas according to package directions. Spoon 1/2 cup egg mixture onto center of each warmed tortilla. Garnish with additional cheese and salsa, if desired. Fold half of tortilla over filling; fold sides toward center, leaving top open. Serve immediately.Servings: 8