Potato pierogies are a classic Polish comfort food dish. You can make these "dumplings" with your favorite filling, but I prefer potato. You can serve them as a side dish or make a large batch for an entree.
In a glass, melt the butter in hot water and stir.
Pour into flour, add in the egg.
On a floured surface, work the dough with your hands.
Roll it into a ball and wrap in saran wrap.
Place in the fridge for 30 minutes.
Chop the onion.
In a skillet, fry the onion in 2 Tbsp butter until clear.
In a mixing bowl mash the potatoes, onions, and cottage cheese together. Add salt and pepper to taste. You want it to be more on the salty side (about 1/2 tsp).
Remove the dough from the fridge and roll it out on a floured surface.
Using a large round glass, cut out circles in the dough.
Fill the dough circle with 1 Tbsp of the filling and fold it in half.
Pinch the sides together so they are sealed, then crimp them.
Bring a pot of water to a boil, add a pinch of salt and a little oil.
Drop the pierogies in one by one and allow them to boil, when they float to the top of the water they are ready.
Using a slotted spoon, remove them from the water and put them onto a plate, cover with a lid from a pan to keep them warm.
Serve with your favorite accompaniments: sour cream, gravy, butter, etc.