Chic-Fil-A Cool Wrap Copy Cat

Name: Chic-Fil-A Cool Wrap Copy Cat
Ingredients: 4-5 oz. chicken breast; 1/4 tsp onion powder; 1/4 tsp italian seasoning; salt (big pinch); pepper (big pinch); 1/2 tbsp olive oil; 1 tbsp butter (for basting, only about a tsp is absorbed into the chicken); 1 tortilla (burrito size); 1 cup spring mix (or 2-3 leaf lettuce pieces); 1 tbsp monterey jack cheese (or cheddar cheese)