Creating the Chicken Avocado Melt Sandwich is easy if you follow these steps:

1. Prepare the Ingredients: Start by slicing the cooked chicken breast and avocado. Set aside.
2. Spread Mayonnaise: Take one slice of bread and spread mayonnaise evenly on one side.
3. Layer Chicken: Place the sliced chicken breast on top of the mayonnaise-covered bread.
4. Add Avocado: Layer the avocado slices over the chicken.
5. Season: Sprinkle salt and pepper over the avocado for added flavor.
6. Top with Cheese: Place a slice of cheddar cheese on top of the avocado.
7. Cover with Bread: Place the second slice of bread on top, with the non-mayo side facing down.
8. Preheat the Pan: Heat a skillet or griddle over medium heat. Add a little olive oil or butter.
9. Grill the Sandwich: Place the sandwich in the skillet. Grill for about 3-4 minutes on one side until golden brown.
10. Flip and Grill: Carefully flip the sandwich and grill the other side for an additional 3-4 minutes or until the cheese is melted and the bread is toasted.
11. Remove and Slice: Once cooked to perfection, remove the sandwich from the skillet and slice it in half.
12. Serve: Plate the sandwich and serve hot.

These step-by-step instructions will guide you to create this incredible Chicken Avocado Melt Sandwich with ease.