Begin by removing two boneless chicken breasts from the fridge and bring them to room temperature (about 15-20 minutes).
2 boneless
Preheat your oven to 350 degrees F.
While you wait, prepare your spice rub. Combine all of the spices in a small bowl. Use a fork to mix.
1/2 tsp garlic powder, 1/2 tsp onion powder, 1/2 tsp dried rosemary, 1/2 tsp parsley, 1 tsp paprika, 3/4 tsp salt, 1/8 tsp black pepper
Preheat the cast iron pan on the stovetop to medium heat
On a cutting board, trim off any extra bits on the chicken breasts and pat dry with a paper towel. Generously sprinkle the spice rub on both sides of the chicken breasts.
Pour a little oil to coat the entire bottom of the cast iron skillet (about 1-2 tablespoons)
1-2 Tablespoons olive oil
Sear the first side of the chicken breast in the hot oil for 5 minutes (Leave it be! Allow it to cook untouched to get that nice sear on the chicken)
Flip to the other side and cook the chicken breast for an additional 5 minutes.
Once seared on both sides, finish cooking in the oven for another 5-10 minutes (depending on thickness. See notes below)
Remove the cast iron from the oven and let the chicken rest for 5-10 minutes before slicing.