This 4-ingredient slow cooker baked mostaccioli is the kind of happy accident every home cook secretly hopes for. I threw it together for a winter potluck—using pantry pasta, jarred sauce, and plenty of cheese—and it came out so comforting and gooey that now it’s the only dish I’m allowed to bring.
Mostaccioli, a tubular pasta similar to penne but traditionally used in Italian-American baked casseroles, holds the sauce beautifully and stands up to slow, gentle cooking. The slow cooker mimics the low-and-slow oven-baked method, giving you tender pasta with a golden, stretchy cheese top and almost no effort.
Four ingredients. One slow cooker. Pure potluck gold.
Why This Dish Works
✅ Just 4 ingredients – Mostaccioli, marinara, mozzarella, Parmesan – that’s it
✅ No boiling pasta first – Goes in raw, cooks in the slow cooker
✅ Perfectly tender pasta – Holds its shape, not mushy
✅ Golden, stretchy cheese top – That glorious, bubbly crust
✅ Set it and forget it – 5 minutes of prep, then walk away
✅ Crowd-sized – Feeds a hungry potluck crowd
✅ Budget-friendly – Pantry staples make a hearty meal
The 4 Ingredients
Ingredient Amount Notes
Mostaccioli pasta 16 oz Penne, ziti, or rigatoni also work
Marinara sauce 2 (24 oz) jars Your favorite brand—quality matters
Mozzarella cheese 3 cups Shredded, divided
Parmesan cheese 1 cup Grated, divided
That’s it. No meat. No onions. No garlic. Just pure, cheesy, saucy perfection.
The Method: Layer, Cook, Top, Devour
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