Slice the chicken breast in half to create two thinner, flatter slices. Rub all sides of each piece of chicken with the Cajun seasoning, salt, and pepper, as well as one of the Tablespoons of olive oil.
Take last two Tablespoons of olive oil and add it to a large skillet, (preferably cast iron), over medium-high heat.
Once the oil is heated and glistening, add the chicken slices. Place the side closest to you down first to avoid hot oil from splattering on you and be careful. You should hear a good sizzle from the pan though.
Refrain from touching the chicken for about 5 minutes so that the bottom gets a nice, golden sear. Even if it blackens a bit, that is fine.
Lift one of the corners up to ensure it’s reached the color that you want. If it sticks, it's not ready to be flipped yet. Once you've ensured that it is ready, flip each piece over. Cook for another 4 minutes or so, then remove the chicken from the heat.
Allow the chicken to rest for 10 minutes before you dice it, this ensures the middle stays nice and juicy!
While the chicken rests, place a hard taco shell in the middle of a soft taco shell. Arrange all six tacos so that they are standing, this makes them easier to fill. I used two of these baskets that each held three tacos. You can also use a casserole dish with higher walls.
Add the lettuce to each hard taco shell, allow some to spill into the soft taco shell. Then add the tomatoes.
Dice the chicken into small squares and add it to the tacos. Top with cheese, then drizzle with ranch dressing. Sprinkle with chopped cilantro, and serve it up!
Notes
*For cheese options you can also use a Mexican blend or cheddar jack! If you like to pack on extra heat, drizzle some hot sauce onto the chicken as it sears.
Optional ingredient additions include: Diced avocado, red onions, sour cream, and salsa!