Slow Cooker Sausages, Peppers and Onions Recipe

This slow cooker sausage and peppers recipe is perfect when you want an easy, hands-off dinner that packs plenty of cozy, comforting flavor. We start by quickly searing the sausages to get those rich, caramelized brown bits, then add crushed tomatoes to deglaze the pan. After that, the slow cooker gently finishes cooking the sausages and softens the peppers and onions until everything is tender and juicy, with the flavors melding beautifully.

The best part? You spend just a little time upfront browning the sausages (about 8 to 10 minutes), then dump everything into the slow cooker and walk away while it works its magic. Cook it low and slow for 4 to 6 hours, or if you’re short on time, crank it to high for 2 to 3 hours. This recipe makes about 6 servings and is super flexible — pile the slow cooker sausage and peppers on toasted rolls for a hearty sandwich, serve it over pasta, gnocchi, or even roasted potatoes for a satisfying family meal.

This is also a pantry-friendly dinner that’s great for making ahead. The leftovers keep well in the fridge for 3 to 4 days or freeze beautifully for up to 3 months. Plus, your slow cooker’s warm setting can keep the dish comfy and ready for about 2 hours if dinner plans shift. Talk about convenient!

• Yields: 6 servings
• Hands-on time: quick 8–10 minute sear
• Cook time: 4–6 hours low, or 2–3 hours high
• Serving ideas: subs, pasta, gnocchi, roasted potatoes
• Storage: refrigerate 3–4 days, freeze up to 3 months

What Makes It So Delicious

This slow cooker sausage and peppers meal shines because it delivers bold, fresh flavor with minimal fuss. Searing the sausages first builds that deep, savory foundation tightened up by the tomatoes. If you love that savory Italian sausage flavor in a faster format, try our Italian Sausage Pasta – 30-Minute Meal. Then the slow cooker works gently to soften the peppers and onions, while keeping the sausages juicy and mouthwatering. It’s a truly forgiving recipe that suits busy weeknights or make-ahead dinners, perfect when you want a hearty meal with zero stress. Plus, it holds easily on the warm setting of your slow cooker for up to two hours, so dinner timing doesn’t have to be exact. For another make-ahead comfort classic that also does beautifully in the slow cooker, see Beef Tips and Gravy (Stove Top or Crock Pot!).

Ingredients and Quantities

• 3 bell peppers (any colors), sliced about ¼-inch thick
• 1 large yellow onion, halved and sliced about ¼-inch thick
• 1 teaspoon garlic powder
• 1 teaspoon dried oregano
• ½ teaspoon crushed red pepper flakes (optional)
• 1 Parmesan rind (optional, for extra flavor depth)
• Salt and black pepper, to taste
• 1 tablespoon extra-virgin olive oil
• 1 ½ to 2 pounds sweet or hot Italian sausage
• One (14-ounce) can crushed tomatoes
• Torn fresh basil leaves, for serving (optional)

How to Cook It

1. Slice bell peppers about 1/4-inch thick and halve and slice the onion about 1/4-inch thick.
2. Layer the sliced peppers, onion, garlic powder, dried oregano, crushed red pepper flakes (optional), Parmesan rind (optional), salt and black pepper in a 5- to 8-quart slow cooker and toss lightly to mix; set aside.
3. Heat 1 tablespoon extra-virgin olive oil in a large skillet over medium heat.

4. Add the sausages and brown evenly, turning occasionally, about 8–10 minutes; brown in batches if needed to avoid overcrowding.

   

5. Transfer the browned sausages to the slow cooker on top of the vegetables.
6. Turn off the heat, pour the 14-ounce can of crushed tomatoes into the skillet, and scrape up the browned bits with a spatula or wooden spoon.
7. Pour the tomato sauce into the slow cooker and gently toss to combine without breaking up the sausages.
8. Cover and cook on low for 4–6 hours or on high for 2–3 hours, until vegetables are tender and sausages reach a safe internal temperature (160°F for pork, 165°F for poultry).
9. Taste and adjust seasoning with salt and black pepper; remove and discard the Parmesan rind before serving.
10. If you want a thicker sauce, simmer the sauce on the stove or leave the slow cooker lid off for the last 30–60 minutes to reduce liquid.
11. Sprinkle torn fresh basil on top before serving (optional).

Pro Tips and Serving Ideas

• Don’t rush the sear: Browning the sausages well for 8 to 10 minutes builds deep flavor from the browned bits that enhance your sauce big time.
• Keep the skillet from overcrowding by browning sausages in batches if needed. This helps them get that golden color instead of steaming.
• Stick to slicing the peppers and onions about ¼ inch thick so they soften nicely during cooking but keep a little texture without becoming mushy.
• If your schedule is tight, cooking on high for 2 to 3 hours works well—just start checking the veggies early to avoid overcooking.
• Safety first: the internal temperature of pork sausage should hit 160°F, and poultry sausage 165°F to be safe.
• Want a thicker sauce? Take the sauce out of the slow cooker and simmer it on the stove, or leave the slow cooker lid off during the last 30 to 60 minutes of cooking to reduce liquid.
• Using a Parmesan rind is a great way to add savory depth to your sauce—just remember to fish it out before serving.

Serve your slow cooker sausage and peppers piled high on toasted hoagie rolls for a classic sandwich experience. Or ladle it over cooked pasta or fluffy gnocchi for an Italian-inspired dinner. Roasted potatoes also make a fantastic base if you want to keep things cozy and comforting. For a fresh, crunchy side, add a Classic Spinach Salad, or bake a tray of zesty baked zucchini sticks. Don’t forget to sprinkle fresh basil on top for a pop of color and flavor!

Mix-Ins and Substitution Ideas

• Change up the sausages: Try chicken, turkey, or bratwurst varieties—just keep an eye on internal temps and cooking times.
• Add more veggies: Mushrooms, zucchini, or eggplant make great additions. Add delicate veggies toward the end to keep their texture.
• Turn up the heat: Increase crushed red pepper flakes or add a splash of your favorite hot sauce for a kick.
• Switch up the tomatoes: Blend crushed tomatoes with a bit of tomato paste for a richer sauce, or use diced tomatoes if you want more texture.
• Cheesy twist: Pile the sausage and peppers onto a roll, sprinkle mozzarella on top, and broil briefly for a delicious cheesesteak-style sandwich.

Feel like trying something new? Swap out the Italian sausage for chicken, turkey, or even bratwurst. Add extra veggies like mushrooms, zucchini, or eggplant to bulk up the dish. For more heat, increase the crushed red pepper flakes or add a dash of hot sauce. Want cheesy goodness? Top everything with mozzarella and broil for a few minutes for an easy cheesesteak-inspired twist.

Storage and Reheating Tips

Store any leftovers in an airtight container in the fridge for 3 to 4 days, or freeze portions in freezer-safe containers or heavy-duty bags for up to 3 months. Be sure to press out the air before sealing. When ready, thaw overnight in the fridge.

To reheat, warm gently on the stovetop over medium heat until hot all the way through, zap in the microwave, or return to your slow cooker on low until warmed. You can also cover and heat in a 350°F oven until warmed through. If your sauce thickened in the fridge, stir in a splash of water or broth while reheating to loosen it up.

Important food safety note: Don’t leave cooked slow cooker sausage and peppers out at room temperature longer than 2 hours. The slow cooker’s warm setting can safely hold this dish for about 2 hours if your dinner plans change. For a party-friendly crock pot appetizer that also keeps well on warm, try Crock Pot Root Beer Lit’l Smokies.

Keep your leftovers fresh by storing them in airtight containers in the fridge for up to 4 days. For longer storage, freeze portions in freezer-friendly bags or containers. Make sure to press out excess air to prevent freezer burn! When reheating frozen portions, thaw them overnight in the fridge for best results before warming them back up.

This slow cooker sausage and peppers recipe is great for heads-up meal prep. You can slice your veggies and even sear the sausages a day ahead to save time when dinner rolls around. Just layer everything in the slow cooker insert, cover it tightly, and refrigerate. When you’re ready, pop it into the slow cooker and start cooking—the flavors will deepen even more!

Common Questions Answered

Q: Can I skip searing the sausages? A: You can, but searing adds that delicious depth of flavor from the browned bits on the pan. Skip it and the dish will still cook but it won’t be as rich and tasty.

Q: Can I use fresh tomatoes instead of canned? A: Absolutely! Use about 2 cups of peeled, crushed, ripe fresh tomatoes for a fresher sauce. Just be aware the texture will change a bit and it might take longer to thicken.

Q: How do I make the sauce thicker? A: Simmer the sauce in a saucepan to reduce it, or leave the slow cooker uncovered during the last 30 to 60 minutes of cooking. You can also stir in a small spoonful of tomato paste at the end.

Q: Is this recipe freezer-friendly? A: Yes! Cool leftovers before portioning and freezing; they’ll keep for up to 3 months. Thaw in the fridge overnight before reheating. For another freezer-friendly slow-cooker meal to batch-cook, try our Slow Cooker Beef Stew.

Q: What internal temperature should I check for? A: Pork sausages are safe at 160°F, and poultry sausages at 165°F.

Q: Can I make slow cooker sausage and peppers without a slow cooker? A: Yes, just put everything in a large Dutch oven, bring to a simmer, cover, and cook on low heat on the stovetop or in a 325°F oven for about 1 to 1.5 hours. Check occasionally until peppers are tender and sausages are cooked.

Q: Can I prepare this dish with different types of sausage? A: Yes! Feel free to experiment with various sausage types like chicken, turkey, or bratwurst, just adjust cook times and check internal temperatures carefully.

Q: How can I keep the peppers from getting too soft? A: Slice them about ¼ inch thick and try cooking on the low setting; if you prefer firmer veggies, reduce slow cooker time slightly or add them halfway through cooking.

Q: Is it necessary to use the Parmesan rind? A: Not at all. It’s optional but really adds an extra layer of savory goodness. Just remember to remove it before serving.

Q: Can I double the recipe? A: Sure! Just make sure your slow cooker is large enough to handle it, or cook in batches to keep everything cooking evenly.

Q: How do I store leftovers safely? A: Refrigerate within 2 hours in airtight containers up to 4 days, or freeze up to 3 months. Always reheat to steaming hot before serving.