butter or olive oil roast beef mashed potatoes onion celery dry gravy mix water flour frozen veggies salt and pepper
Add onion and celery, sauté until onions are translucent. Add in your cooked, diced roast beef.
Add in gravy mix and water. Let simmer until desired consistency. To thicken, mix 1 tablespoon of flour with water and add to pot. To thin out, add more water.
Once desired consistency is reached, add frozen veggies. Let simmer for 2 minutes and then remove from heat.
Assemble your pies in your freezer friendly containers of choice. Add the gravy mixture to the container first, then top with mashed potatoes.