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A comforting slow cooker casserole layered with frozen pierogies, kielbasa, onions, cheddar, and a creamy mushroom-sour cream sauce.
For the creamiest result, use full-fat sour cream. You can substitute with plain Greek yogurt for a lighter option.
Find it online: https://www.simplefamilydishes.com/crockpot-pierogi-casserole-kielbasa/