Slice the tomato, cucumber, and onions into thin slices.
1/2 medium cucumber, 1 medium beefsteak tomato, 1/2 small white onion
Smear one side of a piece of sourdough bread with softened butter.
2 pieces sourdough bread, 2 tablespoons butter
Place face down in the bottom of an air fryer basket.
Use a knife to spread on half of the pesto mayonnaise mixture.
Sprinkle on half of the shredded cheese.
1/2 cup shredded Colby jack cheese
Layer the tomato, onion, and cucumber.
Add the rest of the cheese to the top of the vegetables.
Slather on the rest of the pesto mayonnaise to the last piece of bread. Place mayo sauce side down on top.
Use the rest of the butter on the top of the slice of bread. Sprinkle with dried basil.
2 tablespoons butter, 1/2 teaspoon dried basil
Cook in the air fryer at 350 degrees for 5 minutes.
Use a spatula to flip the sandwich. (See notes)
Return the basket and cook for another 2-3 minutes.
Remove, cut in half and eat immediatley. Enjoy!