Dear Garbage Gourmet
What can I do with used mashed potatoes?
Oh geez! like a bazillion different things!
1) Make em into patties, dip em in bread crumbs and pan fry em
If you find that your potatoes don't hold together well, you can beat up an egg, mix about 2/3 of it into your potatoes and mix together thoroughly. You can then dip each patty into the egg before dipping into bread crumbs.
I'd fry these in oil (just put in about a Tablespoon and swirl it around before you put in each patty or set of patties. If you save your bacon grease you can use that as well to add flavor.
You can also chop up about have an onion very fine and add that to your potatoes before forming them into patties.
2) Make a shepherd's pie
get yourself a pie pan
take a cup or two of leftover meat and chop up
mix with a cup of either frozen or already cooked vegetables - green peas, or chopped up carrots, etc.
add a can of some sorta creamed soup (whatever ya like: cream of mushroom, cream of onion, cheddar cheese)
pour all this into your pie pan
top with your mashed potatoes, spreading them out as evenly as you can manage
sprinkle with paprika to make it pretty
3) mix with 1 cup green peas, 1 Tablespoon curry powder and 1 cup sauteed onions and wrap in flour tortilla for a vague approximation of a Masala Dosai
4) mix with broth to make cream of potato soup, using 2 cups broth to 1 of potatoes
you can used canned broth, or bullion cubes and water
as potatoes are kinda bland be careful about your choice of broth as it's going to predominate in the final product.
SO - homemade vegetable broth which is good for making gazpacho or beet borsht as it's paired with other very strong flavors, might taste kinda green and yucky in potato soup.
Oh yeah, and you wanna make sure to make this absolutely smooth, so I'd suggest you beat the soup with a wire whisk or put it through a food processor.