For the inside of the pierogies I made regular mashed potatoes and added some suateed onions and shredded cheddar cheese.
I made some up and then let them sit in the fridge to chill. Then I rolled out the dough and used a large cup to cut them out. Then I spooned some of the potatoes into the center and folded them over and used my fingers to press and seal them shut.
Then I boiled them and fried them in butter. I like to dip mine in ranch dressing!
For my first time making them they came out pretty good! The kids sure did like them! They are a labor of love though!