Two substantial sandwiches combine sliced cooked chicken, avocado, tomato and melting cheese. Slice the chicken thinly and use only as much filling as the bread can hold securely. Each sandwich uses two of the four listed cheese slices.
01 - Season the chicken with the measured salt and pepper.
02 - Heat the first tablespoon of olive oil in a skillet. Cook chicken on both sides until thick centers reach 165°F.
03 - Rest on a clean board and slice thinly. Slice avocado, tomato and onion.
04 - Spread mayonnaise and Dijon on the inside faces of four bread slices.
05 - On two bottom slices distribute chicken in a manageable layer. Add avocado, two cheese slices per sandwich, tomato and onion.
06 - Close with the remaining bread and reserve any excess chicken safely. Heat butter or the second oil portion in a skillet over moderate heat.
07 - Grill each sandwich on both sides until golden and the cheese melts, lowering heat if needed. Rest briefly, slice and serve.
# Extra Suggestions:
01 - Four bread slices make two sandwiches. Four bread slices make two sandwiches, so divide the cheese into two slices per sandwich. Chicken breast size varies; slice the cooked meat thinly and use only the amount the bread can support, reserving excess safely. Pat tomato slices lightly to remove surface moisture before layering. Spread mayonnaise and mustard on the inner bread faces, keeping the butter or second oil portion for grilling. Use moderate heat so the cheese melts before the bread burns. Add avocado just before assembly and turn the sandwich with a broad spatula while supporting the top.