Avocado Chicken Melt | Easy Cheesy Lunch

Ingredients

• 4 bread slices (pick sourdough, ciabatta, or your favorite)
• Salt and pepper, as needed
• 1 avocado, sliced into pieces
• 4 cheese slices (cheddar, provolone, or Swiss)
• Butter or olive oil for grilling sandwiches
• 2 tablespoons of mayo
• 1 tablespoon Dijon-style mustard
• 2 skinless, boneless chicken breasts
• 1 small red onion, in thin slices
• 1 tomato, cut into slices
• 1 tablespoon olive oil for cooking chicken