So you may have heard of OAMC. Once A Month Cooking. Some people will devote a Saturday each month and cook/prep all the family's meals for the month and freeze them. They'll have soups, sides, main dishes, casseroles. It's amazing. Anyways, i had these potatoes that were crying to not go to waste so I made up a HUGE batch of mashed potatoes and made some Shepherd's Pie. But the fun part is putting it in a cupcake tray and freezing them, making single servings of practically anything. So I even made individual servings of mashed potatoes and froze them!
Give it a try!
Here's a shot of the Shepherd's Pie!