In a large skillet, brown sausage. Drain, reserving 2 tablespoons drippings. Saute the onion, green pepper and mushrooms in drippings until tender.

In another skillet, melt butter over medium-high heat. Add eggs; cook and stir until set.

Divide sausage mixture among tortillas; top with eggs and cheese. Fold bottom of tortilla over filling and roll up. Serve with salsa if desired.