How to Cook Costco Stuffed Peppers (Better Than the Box)

The first time I bought Costco stuffed peppers, I was in survival mode—grading papers with one hand and wrangling dinner with the other. I needed something quick but real. I popped them into the oven, added a bit of extra sauce, and crossed my fingers. What came out was surprisingly good: tender bell peppers, cheesy tops, and a filling that tasted homemade.

Now, I still reach for them on hectic nights—but I’ve learned how to make them even better. In this guide, I’ll show you exactly how to cook Costco stuffed peppers in the oven or air fryer, how to level up the flavor, and what to serve on the side. Whether you’re reheating leftovers or prepping dinner in under 30 minutes, this is one shortcut that truly delivers.

Ingredients You’ll Need

To cook and upgrade your Costco stuffed peppers, you don’t need much—just a few pantry staples to enhance flavor and texture. These additions help replicate that “homemade” touch without starting from scratch.

Upgrade Store-Bought Stuffed Peppers

Costco stuffed peppers are convenient, but a few small tweaks can take them from “weeknight dinner” to “wow, that’s actually homemade.” These are my favorite ways to level them up without starting from scratch.

Add Extra Sauce (or the Right Kind)

While the store version includes some sauce, I always spoon more around the peppers before baking. A high-quality marinara like Rao’s or a spiced tomato basil sauce adds depth and richness. If you’re serving guests, drizzle some underneath when plating for that restaurant-style finish.

Boost the Cheese

Costco’s peppers already include cheese, but you can amplify the flavor and texture with fresh grated Parmesan, mozzarella, or even a little fontina. Add it just before the final 5 minutes of cooking to get that bubbly, golden top.

Use Fresh Herbs and Seasoning

Once they’re out of the oven, I often sprinkle chopped parsley, fresh basil, or thyme. For a punchier flavor, a dusting of garlic powder, smoked paprika, or red pepper flakes can bring the filling to life.

Try a Crunchy Topping

Want texture? Mix a little panko with olive oil and Parmesan and sprinkle it on before the final bake. It adds a nice crunch that contrasts beautifully with the soft peppers.

Include a Flavorful Side

Even a ready-made dish feels homemade when served with the right side. Try a lemon-dressed salad, garlic bread, or creamy mashed cauliflower. Want to try a fully homemade version? Here’s our Costco stuffed peppers recipe that’s even better than the original.

Reheating Costco Stuffed Peppers (Without Drying Out)

Whether you’ve cooked extra or picked up a pack to save for later, reheating Costco stuffed peppers the right way keeps them juicy, cheesy, and satisfying—not soggy or dried out.

Oven (Best for Keeping Texture)

1. Preheat to 350°F (175°C).
2. Place the pepper(s) in an oven-safe dish.
3. Add a splash of water or tomato sauce around the base to maintain moisture.
4. Cover with foil and bake for 15–20 minutes, or until hot.
5. Remove foil for the last 5 minutes to let the cheese re-melt and brown.

This is the best method when you’re reheating multiple peppers or serving guests.

Air Fryer (Fastest with Best Texture)

1. Preheat to 325°F (160°C).
2. Place pepper(s) in the basket.
3. Cook for 8–10 minutes if chilled, 18–22 minutes if frozen.
4. Add extra cheese during the final 2–3 minutes if desired.

Want full timing details? Here’s how to reheat stuffed peppers in the air fryer without drying them out.

Microwave (Quickest for Individual Servings)

1. Place a pepper in a microwave-safe dish.
2. Cover with a damp paper towel to prevent drying.
3. Microwave on high for 2½ to 4 minutes, depending on size.
4. Let it rest for 1 minute before eating.

Pro Tip: Always check that the internal temp hits 165°F (74°C) to make sure it’s safe and hot all the way through.
Not sure? Here’s the USDA’s recommended temperature chart for meat and poultry.

What to Serve with Costco Stuffed Peppers

These hearty stuffed peppers are filling on their own, but pairing them with a thoughtful side can balance the flavors and round out the meal. Here are some quick, easy serving ideas based on what I actually serve at home:

Light & Fresh Sides

• Simple green salad with lemon vinaigrette
• Cucumber and dill yogurt salad for a cool contrast
• Steamed green beans or broccoli for something clean and quick

Hearty Complements

• Garlic bread or crusty rolls to soak up the extra sauce
• Butter-glazed orzo tossed with parsley
• Mashed cauliflower for a low-carb pairing

Quick Weeknight Pairings

• Tomato basil soup for comfort in a bowl
• Roasted vegetables like zucchini, carrots, or Brussels sprouts
• Creamy coleslaw for crunch and contrast

For more easy, comforting dinners, explore these one-pot meals for large families that keep cleanup simple.

How to Cook Costco Stuffed Peppers

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• Author: Chef Huge
• Total Time: 45 minutes
• Yield: 4 servings

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Description

Learn how to cook Costco stuffed peppers to make them taste even better than store-bought. Use your oven or air fryer for easy, delicious results with extra cheese and sauce.

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Ingredients

• Costco Stuffed Peppers
• Tomato Sauce – Adds moisture and deeper flavor; use Rao’s or your favorite marinara.
• Shredded Cheese – Mozzarella, cheddar, or a mix for a gooey finish.
• Italian Seasoning – Optional, but enhances aroma and taste.
• Red Pepper Flakes – Optional for a spicy kick.

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Instructions

1. Preheat your oven to 375°F (190°C). Remove packaging and place the peppers in an oven-safe dish.

2. Pour tomato sauce over and around the peppers to keep them moist and flavorful.

3. Cover with foil and bake for 35–40 minutes if thawed, or 50–60 minutes if frozen.

4. Uncover and top with shredded cheese during the last 10 minutes to melt and brown.

5. Check the internal temperature (should be at least 165°F) before serving.

6. To use an air fryer, preheat to 350°F and cook thawed peppers for 18–22 minutes, or frozen ones for 25–30 minutes.

7. Add cheese and seasonings in the last 5 minutes of air frying. Let cool slightly before serving.

Notes

Pro Tip: Add a layer of tomato sauce under the peppers to prevent burning and keep the bottoms tender.

Variation: Use ramekins in your air fryer to catch melty cheese or sauce overflow.

• Prep Time: 5 minutes
• Cook Time: 40 minutes
• Category: Main Dish
• Method: Baking
• Cuisine: American

What You Need to Make Costco Stuffed Peppers Taste Homemade

To cook and upgrade your Costco stuffed peppers, you don’t need much—just a few pantry staples to enhance flavor and texture. These additions help replicate that “homemade” touch without starting from scratch.

How to Cook Costco Stuffed Peppers (Oven + Air Fryer Instructions)

If you’ve ever wondered exactly how to cook Costco stuffed peppers for the best results, you’re not alone. Since they come pre-cooked, it’s easy to assume you just heat and eat—but the method you use changes everything. Below are my favorite ways to turn the tray into a warm, comforting dinner.

Oven Method (Perfect for Frozen or Larger Servings)

1. Preheat oven to 375°F (190°C).
2. Remove plastic film from the tray and place the peppers in an oven-safe dish.
3. Spoon marinara or tomato sauce around and on top of each pepper.
4. Cover with foil to retain moisture.
   • Bake 35–40 minutes if thawed
   • Or 50–60 minutes if frozen
5. In the final 10 minutes, uncover and add cheese for a golden, bubbly finish.
6. Always ensure the center reaches 165°F (74°C) for food safety.

Pro Tip: Adding a little sauce underneath the peppers keeps the bottoms tender and prevents burning.

Air Fryer Method (Best for 1–2 Peppers)

1. Preheat to 350°F (175°C).
2. Add peppers to the air fryer basket (or use small ramekins to catch overflow).
3. Drizzle with sauce and top with cheese if desired.
4. Cook for:
   • 18–22 minutes (if thawed)
   • 25–30 minutes (if frozen)
5. Check halfway and rotate if needed.
6. Let cool 2–3 minutes before serving.

Pro Tip: The air fryer gives crisp edges and gooey cheese with almost no effort—perfect when cooking for one or two.

Pro Tips & Variations for Costco Stuffed Peppers

What makes this Costco stuffed peppers recipe especially appealing is how easily it can be customized. You can tweak ingredients, switch cooking methods, or add flavor-boosting extras to suit your flavor preferences, nutrition goals, or the ingredients you have on hand. These pro tips and creative variations will help you take this dish from great to unforgettable.

Explore Different Cooking Methods
While oven baking is traditional, these stuffed peppers also cook beautifully in an air fryer. Set the air fryer to 350°F (175°C) and cook for 20 to 25 minutes, flipping or checking halfway to ensure even cooking. Want to skip the oven entirely? Try our air fryer stuffed bell peppers for a crisp, speedy alternative.

Need to reheat leftovers? Here’s exactly how to reheat stuffed peppers in an air fryer for the best flavor and texture without drying them out.

FAQs

Final Thoughts on Cooking Costco Stuffed Peppers

Costco stuffed peppers are more than just a convenience—they’re a solid base for a cozy, weeknight dinner that feels homemade. Whether you bake them straight from the tray or upgrade with extra sauce and cheese, the goal is the same: a real meal with minimal effort.

Over the years, I’ve found that a few small touches—like using Rao’s marinara, fresh herbs, or a quick air fryer finish—make all the difference. You don’t need to start from scratch to serve something comforting and flavorful.

Next time you’re staring into the fridge after a long day, remember this shortcut. With just a few pantry additions and a bit of care, you can turn Costco’s deli pick into something that feels like you made it yourself.

If you try a variation or serve it in a new way, I’d love to hear how it goes. Cooking is always evolving—and I’m glad to share this part of the journey with you.