Slow Cooker Italian Stuffed Peppers Recipe with Mozzarella

These slow cooker Italian stuffed peppers are an easy, crowd-pleasing meal. Colorful bell peppers are filled with a savory mix of Italian sausage, rice, vegetables, bread, and cheese, then slow-cooked until tender.

Stuffed peppers aren’t about fancy plating — they’re about comfort and satisfying flavor. These slow cooker Italian stuffed peppers deliver classic Italian tastes without fuss: seasoned sausage, melty cheese, tender peppers, and a touch of basil to finish. If you want a make-ahead dinner that feeds a group and tastes better the next day, this is a reliable recipe.

What you need to make this recipe

Below are the ingredients and typical quantities used for these Italian-style stuffed peppers. Use the amounts as a guide and adjust for taste or dietary needs.

• 1 onion, minced
• 6 garlic cloves, minced
• 1 tbsp extra-virgin olive oil
• 1 tbsp tomato paste
• 1/4 tsp red pepper flakes
• 4 large bell peppers (use rounder peppers for easier stuffing; red, orange, and yellow are sweeter)
• 1 slice good white or Italian-style bread, torn
• 1/4 cup whole milk
• 12 oz Italian sausage, removed from casing
• 1 small zucchini, seeded and cut into 1/4″ pieces
• 3/4 cup shredded Monterey Jack cheese
• 3/4 cup cooked rice (slightly undercooked is best)
• 1/4 cup grated Parmesan cheese
• Salt and pepper, to taste
• 2 tbsp fresh basil, minced for garnish

How to make slow cooker Italian stuffed peppers

Hands-on prep takes about 20 minutes; the slow cooker does the rest. The method below keeps things simple and foolproof.

1. Soften the aromatics

In a microwave-safe bowl (or in a small pan on the stove), combine the minced onion, olive oil, tomato paste, and red pepper flakes. Heat about 5 minutes, stirring occasionally, until the onion is softened and the paste is incorporated.

2. Prepare the peppers

Trim about 1/2″ off the top of each pepper, remove seeds and pith, and finely chop the reserved tops to add to the filling.

3. Make the filling

In a large bowl, mash the torn bread with the milk using the back of a fork until combined. Stir in the cooked onion mixture and the chopped pepper tops. Add the Italian sausage (raw), diced zucchini, shredded Monterey Jack, cooked rice, and Parmesan. Season well with salt and pepper and mix thoroughly by hand. Pack the mixture firmly into each cored pepper.

4. Cook in the slow cooker

Pour 1/3 cup water into the bottom of your slow cooker to create steam. Stand the stuffed peppers upright so they remain stable while cooking. Cover and cook on low for about 4–6 hours, until the peppers are tender and the filling is cooked through.

5. Serve

Carefully remove the peppers with tongs or a slotted spoon, transfer to plates, let cool a few minutes, and slice in half if desired. Garnish with extra grated Parmesan and fresh basil before serving.

Do you have to cook meat before stuffing peppers?

No — with this slow cooker method you can add raw sausage to the filling. The low, long cook time brings the meat to a safe temperature and melds flavors. If you prefer, you may brown ground meat first for extra texture and flavor.

Tips, tricks, and notes for this recipe

• Choose sweeter peppers (red, orange, yellow) for milder flavor; green peppers work if you prefer them.
• Remove the spongy pith and seeds before stuffing to avoid bitterness.
• Any ground meat can substitute for Italian sausage — turkey, beef, or chicken work. If you swap, season the filling accordingly because Italian sausage contributes a lot of the seasoning.
• Arborio rice works well if you want a creamier, slightly starchier filling, but any rice, farro, quinoa, or cauliflower rice can be used.
• Cook rice just until slightly firm so it won’t turn mushy during the slow cook.
• Using Italian-style or a rustic French bread yields better texture than soft sandwich bread, but plain white bread will work in a pinch.

Can Italian stuffed peppers be made ahead of time?

Yes. Assemble the stuffed peppers and store them in an airtight container in the refrigerator for a day or freeze for longer storage. Thaw overnight in the fridge before cooking, then follow the slow cooker instructions.

How to store

Cooked stuffed peppers keep well in the refrigerator for 3–4 days and in the freezer for up to 3 months. Reheat in the microwave or in a low oven until warmed through; frozen peppers should be thawed in the fridge overnight before reheating.

Other stuffed pepper recipes to try

If you enjoy these Italian-style stuffed peppers, consider trying variations such as mac and cheese stuffed peppers, enchilada-style stuffed poblanos, lamb-stuffed peppers, chicken tinga stuffed peppers, or pulled pork stuffed peppers for different flavor profiles.