Preheat the oven to 375°F and line a sheet pan with parchment paper.
In a large bowl, mix the melted butter with taco seasoning.
Add shredded rotisserie chicken to the bowl and toss until evenly coated.
Lay tortillas flat on a clean surface.
On one half of each tortilla, sprinkle a bit of cheese, add some of the chicken mixture, any optional add-ins, and a little more cheese.
Fold the tortilla over to create a half-moon.
Brush the top and bottom of each folded quesadilla with avocado oil or melted butter.
Place quesadillas on the prepared sheet pan.
Bake for 10–12 minutes, flipping once halfway through, until golden, crispy, and the cheese is melted.
Let cool slightly before slicing. Serve warm with avocado crema, guacamole, salsa, or sour cream.
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