Step 1: Mix the flour and sour cream well until it forms a dough. Roll it out on a floured surface.
Step 2: Using a small cup or other cutter, cut out ~3inch circles of dough. You can re-roll the pieces about 4 times.
Step 3: Place ~1 tsp of mashed potatoes in the middle of the circle of dough. Press the sides together to make a half-moon shape. Crimp the edges with a fork.
Step 4: Drop into boiling water and simmer for about 5 minutes to cook the dough. Drain.
Step 5: Melt a half stick of butter (or as much as your arteries can handle!) and cook the onions until translucent and slightly browned.
Step 6: Fry the pirogi in the butter & onions about 3 minutes, until yellow-brown on both sides. Enjoy!
They weren’t quite as good as my grandma’s or mom’s, but pretty darn good for a first attempt! And I have the rest of forever to perfect my techniques.