Air Fryer Cheesy Ham and Caramelized Onion Melt

This golden, crispy sandwich is packed with savory ham, sweet caramelized onions, and gooey melted cheese. It’s a quick and satisfying lunch or easy weeknight dinner.

Prep Time: 15 minutes
Cook Time: 15 minutes
Total Time: 30 minutes
Servings: 2

Ingredients

For the Caramelized Onions

1 medium onion, thinly sliced
1 tablespoon butter
1 teaspoon olive oil
Pinch of salt

For the Sandwiches

4 slices sourdough, Texas toast, or your favorite sandwich bread
4 slices deli ham (or about 6 oz/170 g sliced ham)
4 slices cheddar, Swiss, or provolone cheese
2 tablespoons mayonnaise or softened butter (for spreading)
1 teaspoon Dijon mustard (optional)

Instructions

Caramelize the onions: Heat the butter and olive oil in a skillet over medium-low heat. Add the sliced onions and a pinch of salt. Cook, stirring occasionally, for 12–15 minutes until soft, golden, and caramelized. Let cool slightly.
Assemble the sandwiches: Spread mayonnaise or butter on one side of each slice of bread. If using Dijon mustard, spread it on the inside of two slices.
Layer each sandwich with:
- 1 slice of cheese
- Ham
- Caramelized onions
- Another slice of cheese
- Top with the remaining bread, buttered side facing out.
Air fry: Preheat the air fryer to 370°F (188°C) for 3 minutes.
Place the sandwiches in the air fryer basket in a single layer. Cook for 4–5 minutes, then carefully flip and cook another 3–5 minutes, or until the bread is crisp and golden and the cheese is fully melted.
Let the sandwiches rest for 1–2 minutes before slicing and serving.

Optional Add-Ins

Crispy cooked bacon
Sliced tomatoes
Fresh spinach or arugula
Pickled jalapeños
Sautéed mushrooms
A sprinkle of everything bagel seasoning

Serving Suggestions

Pair with:

Tomato soup
Potato chips
French fries
Coleslaw
Dill pickles
Mixed green salad

Storage & Reheating

Refrigerator: Wrap leftovers and refrigerate for up to 2 days.
Reheat: Air fry at 350°F (175°C) for 3–4 minutes until hot and crispy. Avoid microwaving if you want to keep the bread crisp.

Tips

Use freshly grated cheese for the best melt and flavor.
Don’t overfill the sandwich, or the cheese may leak out while cooking.
If your air fryer runs hot, check the sandwich after 3 minutes on each side to prevent over-browning.