In a large skillet, brown the sausage. Remove from heat and drain excess fat. Set aside. Brown potatoes in oven by placing them on a baking sheet and broiling according to package instructions until crisp. Meanwhile, mix eggs, milk, salt and pepper together in a medium mixing bowl. Over medium heat, melt the butter in separate large skillet. Add egg mixture to skillet and scramble the eggs, removing from heat once the eggs are cooked but still moist. Warm green chili sauce over medium heat in saucepan until warmed through.Warm the flour tortillas on skillet or in the microwave until soft and flexible. Fill tortillas with 1/3 cup scrambled eggs, 2-3 T. sausage, and 1/3 cup potatoes. Top with cheddar cheese and green chili sauce according to taste. Fold tortillas snuggly into burritos. Wrap each burrito in plastic wrap, then place in freezer bags. Freeze.Remove burrito from freezer and remove plastic wrap. Wrap in a paper towl and place in microwave on defrost for 3 minutes, then on high for 1 minute. Let cool and enjoy with sour cream or salsa!