Preheat oven to 350 degrees.

Add italian seasoning, chili powder, salt, and pepper to a small bowl. Stir together seasonings. Then press seasoning blend into both sides of chicken.

Add oil to cast iron skillet on the stovetop. Heat to medium-high heat. Once skillet is hot, add all 4 chicken breasts to the oil. Sear until browned, about 4 to 5 minutes. Chicken will not be fully cooked. We're just looking for some good browning at this step. Flip. Sear the other side.

Once both sides of the chicken breasts are browned, add minced garlic to the skillet. Sauté until golden in color, about 1 minute.

Add chicken stock and lemon juice to the skillet. Move the chicken to the outside of the skillet and then place the block of feta in the center of the skillet. Add tomatoes to the skillet. Spoon some of the liquid over the feta and tomatoes.

Place the cast iron skillet in the oven. Bake for 20 - 25 minutes, until the internal temperature reaches 165 F.

Once chicken is cooked through, remove from the oven and let it rest for 5 minutes.

Remove chicken from skillet and set aside. Use a fork or spoon to stir the feta and tomatoes into the sauce. Add the chicken back to the skillet and spoon sauce over top. Top everything with thinly sliced fresh basil.