Step 1: Heat olive oil in a large skillet over medium-high heat. Add the diced chicken and season with salt, pepper, and onion powder.
Step 2: Sauté the chicken for 5-7 minutes until cooked through. In the last 2 minutes of cooking, add half of the minced garlic to the pan and stir constantly to avoid burning.
Step 3: Remove chicken from the pan. In a small bowl, mix the remaining minced garlic with the melted butter.
Step 4: Lay each tortilla flat. If using, spread a thin layer of Greek yogurt or mayo in the center. Top with a handful of spinach, followed by a portion of the garlic chicken.
Step 5: Sprinkle a generous amount of cheddar and mozzarella over the chicken on each wrap.
Step 6: Fold the sides of the tortilla inward and roll tightly. Brush the outside of each wrap with the prepared garlic butter.
Step 7: Place the wraps seam-side down in the same skillet over medium heat. Toast for 2-3 minutes per side until the cheese is melted and the tortilla is golden brown and crispy.