Heat oven to 350. Lightly spray a 9" x 13" casserole dish w/ cooking spray. In lg bowl, beat eggs, milk, salt and pepper.
In lg skillet, melt butter over medium heat. Add onions and peppers. Saute until soft. Reduce heat to med-low. Add egg mix, scramble eggs until just cooked and fluffy.
Evenly spoon egg mix into center of each tortilla. Top w/ 1 tbap salsa. Roll up tortilla and place in casserole dish. Spoon 2 tbsp salsa on top of tortilla, sprinkle w/ cheese. Cover dish w/ foil. Bake 25 mins. Serv w/ sour cream and scallions.