Chicken Avocado Melt Sandwich with Cheese and Avocado - cookrisp

Ingredients

• 2 boneless skinless chicken breasts
• Salt and pepper, to taste
• 1 tablespoon olive oil
• 1 avocado, sliced
• 4 slices of cheese (Swiss, cheddar, or provolone)
• 4 slices of bread (sourdough, ciabatta, or your choice)
• 2 tablespoons mayonnaise
• 1 tablespoon Dijon mustard
• 1 small red onion, thinly sliced
• 1 tomato, sliced
• Butter or olive oil for grilling sandwiches