How to Make Crockpot Pierogi Casserole: Layer the Ingredients: Start by placing your frozen pierogies in the slow cooker, followed by the diced onion and kielbasa slices. This gives you a great ...

Cook in the Crockpot: Pour the cheesy mixture over the pierogies and kielbasa in the slow cooker, ensuring everything is well-coated. Cover and cook on low for 6-8 hours or high for 3-4 hours ...