Cheeseburger Quesadillas
1 clove garlic, minced 1 cup shredded Cheddar cheese, divided 1 pinch salt 1 romaine lettuce heart, sliced 1 tablespoon butter, divided 1 tablespoon milk 1 tomato, sliced 2 (12 inch) flour tortillas 2 tablespoons Thousand Island dressing, divid… ¼ cup shredded mozzarella cheese ½ pound ground beef ½ red onion, diced ½ red onion, sliced