Choose your flavor path. Pick one sauce option from the list above. Each one pairs perfectly with frozen meatballs and needs minimal effort.
Prep any aromatics. For marinara or Asian-style, quickly sauté onion and garlic in a splash of olive oil until fragrant.
This step adds depth, but you can skip it if you’re short on time.
Whisk the sauce. In a bowl, combine your chosen sauce ingredients. Taste and adjust sweetness, salt, or heat. A balanced sauce saves the whole dish.
Load the crockpot. Add frozen meatballs to the slow cooker.
Pour the sauce over the top and stir to coat. Keep the meatballs mostly submerged to prevent drying.
Cook low and slow. Set to Low for 4–6 hours or High for 2–3 hours. You want the meatballs heated through and tender, with the sauce slightly thickened.
For Swedish gravy: Melt butter in a saucepan, whisk in flour to make a light roux, then slowly whisk in broth.
Add cream, Worcestershire, Dijon, and a pinch of nutmeg. Pour over meatballs, then cook as directed.
Finish and garnish. Stir gently, taste for seasoning, and add fresh herbs, Parmesan, or a squeeze of lemon (for marinara) or a sprinkle of sesame seeds and green onions (for Asian-style).
Serve your way. Pile over pasta, noodles, mashed potatoes, or rice. For parties, set out slider buns and let everyone build their own.