Brown sausage in a skillet over medium heat (5–7 mins), then drain excess fat.
In a bowl, whisk eggs, milk, salt, and pepper until frothy.
Pour eggs into a nonstick skillet, scramble until just set (2–3 mins).
Cook frozen potatoes according to package directions (or sauté fresh ones).
Lay tortillas flat, divide sausage, eggs, potatoes, cheese, and optional veggies evenly among them.
Fold in sides, then roll tightly like a burrito.
Let burritos cool completely before wrapping individually in foil or parchment paper.
Place wrapped burritos in a zip-top freezer bag, remove air, and seal.
