01 -
Sprinkle salt and pepper over both sides of the chicken breasts to season them. In a skillet, heat olive oil on medium-high until it starts looking shiny. Cook the chicken for about 6–7 minutes per side, letting it develop a lovely crust. Once done, set it aside to rest for a bit and then slice it up thinly.
02 -
While your chicken chills, slice the avocado into nice, even slices. Chop up the tomato and onion thinly, and keep your cheese slices handy.
03 -
Spread a thin layer of Dijon and mayo across your bread slices. This will make them taste amazing and help create a golden crust when cooked.
04 -
Time to stack it up! Lay chicken slices, avocado, and cheese onto two of your bread slices. Add the onion and tomato on top, then place the other bread slices on top, with the spread side facing inward.
05 -
Heat a skillet or grill pan on medium. Add a little butter or olive oil, then cook the sandwiches until golden and the cheese is deliciously melted—about 3–4 minutes per side. Gently press each one with your spatula to help it all come together.