Costco stuffed peppers are a convenient, flavorful, and hearty meal option that combines the sweetness of bell peppers with savory fillings, often including seasoned ground beef, rice, and a melty layer of cheese. While they can be baked in a conventional oven, using an air fryer transforms the cooking process into a faster, energy-efficient experience that delivers evenly heated, slightly crisped peppers without sacrificing juiciness or flavor. Air fryers work by circulating hot air rapidly around the food, creating a cooking environment similar to convection baking, which results in perfectly tender vegetables and thoroughly heated fillings. Understanding the optimal temperature and timing is key to preserving the integrity of both the pepper and its filling.
The ideal temperature for cooking Costco stuffed peppers in an air fryer is 350°F (175°C). This temperature strikes a balance between thorough heating and gentle roasting: high enough to warm the filling evenly and slightly caramelize the exterior of the pepper, but not so high that the outer pepper scorches before the inside is fully cooked. Cooking at this temperature ensures the cheese melts to a gooey consistency while the peppers retain a slight firmness, rather than becoming mushy.

For pre-cooked or fully assembled Costco stuffed peppers, the typical air fryer cooking time is 12-15 minutes at 350°F. If the peppers were frozen, extend the time to 18-20 minutes, flipping halfway through for uniform heat penetration. This timeframe allows the filling to reach a safe internal temperature without overcooking the pepper itself. Always consider the size and thickness of the peppers; larger peppers may require a few extra minutes.
Determining doneness is both visual and practical:
If the pepper is browning too quickly but the filling is still cold, tent it with aluminum foil (if your air fryer allows) and continue cooking.
Cooking Costco stuffed peppers in the air fryer typically doesn’t require additional ingredients since they are pre-seasoned and filled. However, for enhancements:
Yes. Costco’s pre-made stuffed peppers can be cooked directly in the air fryer without removing the filling. You should place the peppers in a single layer, ideally still inside their foil cups or on a small piece of foil to catch any melted cheese or juices.
The recommended temperature is 350°F (177°C). This temperature allows the peppers to heat evenly while preventing the cheese from burning or overbrowning before the filling is fully warmed.
Cook them for 15-20 minutes. Larger or more densely packed peppers may require up to 25 minutes. Check the internal temperature to ensure it reaches at least 165°F (74°C) for safe consumption.
Preheating is recommended for best results. Preheat the air fryer for 3-5 minutes at 350°F to ensure the peppers begin heating immediately and cook more evenly.
Foil is not usually necessary. However, if the cheese is browning too quickly, you can loosely tent the tops with foil for the remainder of the cooking time. Avoid tightly sealing foil to maintain air circulation.
Yes. Increase the cook time to 25-30 minutes at 350°F and check that the internal temperature reaches 165°F. You may also reduce the temperature slightly to 330-340°F if the cheese begins to brown before the center is heated.
Use the foil cups the peppers come in or place them in a small oven-safe dish that fits inside your air fryer basket. This helps stabilize the peppers and prevents filling from spilling during cooking.