Instructions:

1. Prepare the Avocado Spread:

   • In a small bowl, mash the ripe avocado with a fork. Add lime juice, salt, and pepper to taste. Mix until well combined.

2. Assemble the Sandwich:

   • Spread a thin layer of mayonnaise on one side of each slice of bread.

   • On the unbuttered side of one slice, layer the sliced grilled chicken, followed by the mashed avocado, shredded cheese, and sliced tomato (if using). Top with fresh lettuce.

3. Complete the Sandwich:

   • Place the second slice of bread on top, with the mayonnaise side facing inward.

4. Toast the Sandwich:

   • In a skillet over medium heat, add a little butter. Once melted and sizzling, place the sandwich in the skillet. Cook for about 3-4 minutes until the bottom is golden brown.

   • Carefully flip the sandwich and add a little more butter if necessary. Cook for another 3-4 minutes until the other side is golden and the cheese is melted.

5. Serve:

   • Remove the sandwich from the skillet and let it cool for a minute. Slice in half, serve with your favorite side (like chips or a salad), and enjoy your delicious Chicken Avocado Melt Sandwich!

This sandwich is not only quick and easy to prepare but also packed with flavor and nutrition—perfect for lunch or a light dinner!