Prepare the Chicken

1. Season the Chicken – Rub the chicken breasts with olive oil, then season with garlic powder, paprika, salt, and black pepper.
2. Cook the Chicken – Heat a skillet over medium heat and cook the chicken for about 4-5 minutes per side until golden brown and fully cooked. Let it rest for a few minutes before slicing.

Prepare the Avocado Spread

1. Mash the Avocado – In a small bowl, mash the avocado with lemon juice, salt, and red pepper flakes for a slight kick.

Assemble the Sandwich

1. Butter the Bread – Spread softened butter on one side of each bread slice.
2. Layer the Ingredients – On the unbuttered side of two bread slices, spread a thin layer of mayonnaise (if using). Then, add a slice of cheese, sliced chicken, a generous layer of avocado spread, another slice of cheese, and top with the second piece of bread (buttered side facing out).

Cook the Sandwich

1. Toast the Sandwich – Heat a skillet or griddle over medium heat. Cook the sandwich for about 3-4 minutes per side, pressing down gently with a spatula, until the bread is golden brown and the cheese is melted.
2. Slice and Serve – Let the sandwich rest for a minute, then cut in half and serve warm.