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Close-up of a Chicken Avocado Melt Sandwich sliced in half showing melted Swiss cheese and creamy avocado layers on golden sourdough bread

Chicken Avocado Melt Sandwich

A golden, cheesy grilled sandwich packed with tender sliced chicken breast, creamy avocado, melted Swiss cheese, Dijon mustard, and fresh tomato on toasted sourdough bread. Ready in 30 minutes.
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Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Servings: 4 portions
Course: Dinner, Lunch, Main Course
Cuisine: American
Calories: 450
Ingredients Equipment Method Notes

Ingredients
  

  • 2 boneless skinless chicken breasts
  • salt and pepper to taste
  • 1 tbsp olive oil
  • 1 avocado sliced, Hass recommended
  • 4 slices cheese Swiss, cheddar, or provolone
  • 4 slices bread sourdough or ciabatta recommended
  • 2 tbsp mayonnaise
  • 1 tbsp Dijon mustard
  • 1 small red onion thinly sliced
  • 1 tomato sliced
  • butter or olive oil for grilling

Equipment

  • Skillet or frying pan
  • Grill pan or second skillet
  • Spatula
  • Sharp knife and cutting board

Method
 

  1. Season both sides of the chicken breasts generously with salt and pepper.
  2. Heat 1 tablespoon of olive oil in a skillet over medium-high heat. Once shimmering, add the chicken breasts and cook for 6 to 7 minutes per side until fully cooked through with no pink remaining. Internal temperature should reach 165 degrees F.
  3. Remove chicken from the skillet and let rest for 3 to 4 minutes, then slice thinly against the grain.
  4. While the chicken rests, slice the avocado and tomato and prepare your cheese slices.
  5. Spread an even layer of mayonnaise and Dijon mustard on one side of each bread slice. On two slices, layer the sliced chicken, avocado, cheese, red onion, and tomato.
  6. Top each sandwich with the remaining bread slices, spread side down. Press gently to compact the layers.
  7. Heat a clean skillet or grill pan over medium heat. Add butter or olive oil. Cook sandwiches for 3 to 4 minutes per side, pressing down lightly with a spatula, until the bread is deep golden brown and the cheese is fully melted. Do not use high heat or the bread will burn before the cheese melts.
  8. Remove from heat, let rest for one minute, then slice in half and serve warm.

Notes

Use ripe but firm Hass avocado for best texture. Slice avocado just before building the sandwich to prevent browning. Swiss cheese melts especially well in this recipe. Leftover rotisserie chicken works great as a time-saving shortcut. Store cooked chicken separately and build sandwiches fresh for best results. Reheat in a skillet over low heat to keep the bread crisp.