Follow these simple steps to create your own Chicken Avocado Melt Sandwich:

1. Prepare the Chicken: Season the chicken breasts with salt, pepper, garlic powder, and onion powder.
2. Cook the Chicken: Heat olive oil in a skillet over medium heat. Add the chicken breasts and cook for 6-7 minutes on each side or until cooked through and no longer pink in the center.
3. Slice the Chicken: Once cooked, remove the chicken from the skillet and let it rest for a few minutes. Then, slice it into thin strips.
4. Mash the Avocado: In a small bowl, mash the ripe avocado with a fork. Season with a pinch of salt and pepper to taste.
5. Assemble the Sandwich: On two slices of whole-grain bread, spread a generous amount of mashed avocado. Layer the sliced chicken on top, and add a slice of cheddar cheese.
6. Top and Toast: Place the remaining slices of bread on top of each sandwich. Heat the skillet again over medium heat and place the sandwiches in the skillet. Cook for about 3-4 minutes on each side, or until the bread is golden brown and the cheese is melted.
7. Garnish and Serve: Remove the sandwiches from the skillet and garnish with fresh cilantro or parsley, if desired. Cut in half and enjoy!