Hatch Chile Grilled Chicken Avocado Sandwich

Ingredients

• 1 large chicken breast, boneless, skinless, cut lengthwise
• ¼ cup olive oil
• 2 tablespoons white vinegar
• 2 tablespoons lime juice
• 2 tablespoons chopped fresh cilantro
• ½ teaspoon garlic salt
• ½ teaspoon dried red pepper flakes
• 1 tablespoon Real California butter
• 2 large bolillo rolls, sliced in half
• 2 tablespoons mayonnaise, divided
• 5 ounces Real California Oaxaca cheese, shredded
• 1 Roma tomato, sliced
• 2 fresh hatch chiles
• 1 large avocado, mashed