This recipe comes from the "Make-A-Mix" Cookbook. So, technically, you can make the meat sauce ahead of time, freeze it and use it for many other recipes. We just make the Shepherd's Pie, so I'll give you the 1 batch version (normally, it is 5 batches).
1 small onion, sliced
1/4 tsp minced garlic
1/3 -1/2 C finely chopped celery
1/2-3/4 C chopped carrots
1 lb ground beef
1 tsp salt
dash of pepper
1/2 Tbsp worchestershire sauce
1 C ketchup
dash of hot sauce (optional)
Saute onions, garlic, celery, and carrots over medium heat, until onions are golden. Add grounf beef, stir and cook until meat is browned. Add salt, pepper, worchestershire sauce, ketchup and hot sauce. Cover and simmer 20 minutes.
Meat Sauce (above)
1 can french-cut green beans, drained or 1 pkg frozen green beans
2 C mashed potatoes
1 C grated cheddar cheese
Preheat oven to 350 degrees. Spray a 1 1/2 qt casserole dish. Layer casserole in order listed above ending with the cheddar cheese. Bake for 25-30 minutes, until bubbly.
You could also make this up ahead of time and top with cheese just before baking - which is probably what I will do since it is for my "Meal Swap" night. So yummy!