Mix all spices in a bowl. Spread them out on a plate.
Heat a non-stick skillet to medium-high. Place the melted butter in a bowl. Dip each chicken fillet in the butter.
Coat the chicken breasts with the spices by pressing them into the spice mixture on both sides.
Heat 2 tablespoons of canola oil in the pan. Carefully place the chicken fillets in the skillet and fry until fully cooked and blackened on both sides (about 3 to 5 minutes per side). The internal temperature should reach 165°F.
Slice the chicken into strips on a cutting board.
Add the strips to the ciabatta buns along with the mayo, lettuce and red onion.
Serve!
Video
Notes
Fridge storage: Leftover cooked chicken can be refrigerated for up to 3 to 4 days.
Keep the buns fresh: You can freeze the buns to keep them fresher. Just thaw them at room temperature a couple of hours before preparing the sandwiches.
Heat the buns. If you want to take it up a notch, heat the ciabatta rolls in a 400°F/200°C oven for 2 to 4 minutes. Let them cool until you can handle them and then slice them in half and build the sandwich.
Slicing raw chicken breasts: When it comes to handling meat, especially trimming or cutting them, you need to be extra careful. The first thing to do is to sharpen the blade. The sharper the blade, the easier and smoother the cut. You can also find pre-sliced chicken breast fillets at the supermarket if you'd like to skip this step!