Cook pork sausage in skillet, breaking into small pieces, until done. Drain on paper toweling. Return to skillet.
In a medium bowl, whisk together eggs, milk, onion powder, salt and pepper. Pour over sausage and cook over medium heat, stirring to scramble the eggs.
Place about 1/4 cup of the sausage and egg mixture in the middle of a flour tortilla. Sprinkle with cheese and drizzle with salsa. Fold up tortilla and place on a freezer-safe sheet.
Once all of the tortilla are ready, cover the baking sheet with foil and place in the freezer until frozen. Then transfer the burritos to a freezer bag.
Place a burrito on a microwave safe dish. Heat on high for 1 minute. Flip the burrito and cook for 1 minute longer. Allow to sit until the heat is evenly distributed and serve. (Cooking times may vary based on the wattage of your machine.)