Crockpot Pierogi Casserole with Kielbasa is a comforting and simple dish made with frozen pierogies, slices of kielbasa sausage, cheddar cheese, and a creamy blend of sour cream, cream of mushroom soup, and garlic. Perfect for busy nights, this one-pot meal can be enhanced with optional ingredients like bacon, cream cheese, and Dijon mustard for added richness and flavor. Garnished with fresh parsley, this recipe is a hearty crowd-pleaser.