On top of a paper towel, place the first tortilla. Spoon 1/3 cup refried beans, 1/2 cup shredded chicken, and 1/4 cup shredded cheese onto the center of the tortilla. Top with a sprinkle of sautéed veggies.
Fold two opposite sides of the tortilla together. Fold in a third side of the tortilla and roll up, keeping the ends tucked in as you go.
Roll burrito up in paper towel, and then roll up in foil. Repeat for the rest of the burritos, and then place in gallon-size freezer bag. Write today's date on the bag and store for up to several months.
To reheat: Remove foil and microwave burrito inside of paper towel for 3-4 minutes if frozen. For best results, place burrito in fridge to thaw the night before and then microwave for 1 1/2-2 minutes. Let cool briefly before enjoying!
Variations: Use black beans instead of refried beans, leave out the chicken and increase the veggies for a vegetarian version, substitute shredded beef instead of the chicken, or add enchilada sauce for some extra spice. (I'd avoid using salsa, though, since it may make your tortilla soggy.)