Prepare the Spice Mix by combining chili powder, kosher salt, and garlic powder in a small bowl. Set aside.

Season the cooked chicken with half of the spice mix, stirring well. Set aside.

Sauté the onion and bell peppers in olive oil over medium heat, adding the remaining spice mixture. Cook until onions are translucent.

Combine sautéed vegetables with the seasoned chicken in a bowl, stirring until well mixed.

Assemble each quesadilla by layering cheese, chicken and vegetable mixture, then more cheese before folding in half.

Cook each quesadilla in a skillet over medium heat until each side is golden brown and cheese is melted. About 4 minutes per side.

Slice cooked quesadillas into wedges and serve with salsa, sour cream, or guacamole.