Get the slow cooker ready.
Choose a slow cooker that can fit all the ingredients comfortably. A 6-quart slow cooker is good for this recipe, but a 4-quart one will also work if you want a smaller casserole.
Spread a little non-stick spray or butter inside the slow cooker before adding the ingredients. This will help prevent sticking and make cleaning up easier.
2. Put together the casserole.
Include the Pierogies: Open the packages of Mrs. T’s Cheddar Pierogies. If you are using small pierogies, you can just put them in the slow cooker. If you like regular-sized pierogies, cut them into small pieces before cooking to make sure they cook evenly and are easy to serve.
Cut the kielbasa into slices that are ¼ inch thick. This will help the sausage spread evenly in the casserole and give the dish a smoky taste. Put the cut sausage in the crockpot.
Add cream cheese: Take the 8-ounce block of cream cheese out of its packaging and cut it into smaller pieces. This will make it easier to melt and mix evenly i
