Ingredients

• 1 ripe avocado , sliced
• 1 tablespoon lemon juice
• 1 tablespoon butter
• 1 large Vidalia onions , sliced into rings
• 4 boneless , skinless chicken breast halves
• salt and pepper to taste
• 4 hamburgers buns
• 4 tablespoons mayonnaise
• 4 slices provolone cheese

Instructions

1. 1 Combine sliced avocado and lemon juice in a small bowl. Add water to cover; set aside.
2. 2 Preheat an outdoor grill for high heat and lightly grease the grate.
3. 3 Heat butter in a large heavy skillet over medium-high heat. Sauté onions until browned and caramelized; set aside.
4. 4 Season chicken with salt and pepper. Place on grill and cook until no longer pink and juices run clear, about 5 minutes on each side. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).
5. 5 Place buns on grill just long enough to toast them.
6. 6 Spread buns with mayonnaise to taste, then layer with chicken, caramelized onion, provolone, and avocado.

Nutrition per serving