Place the yogurt, lemon juice, red chili powder, red pepper flakes, garlic paste, ginger paste, salt and tandoori seasoning in a large mixing bowl. Mix well.
2 cups plain yogurt, juice of 1 lemon, ½ tsp red chili powder or cayenne pepper, ½ tsp red pepper flakes, 1 tbsp garlic paste or 3 cloves garlic, 2 tsp ginger paste or 1 teaspoon ground ginger, 1 tsp kosher salt, 2 tbsp tandoori seasoning, 1½ tsp smoked paprika
With a paper towel, gently pat the chicken dry. Cut slits across the tops of each chicken piece, 1” apart and ½” deep. Add the chicken to the bowl and rub the seasoned yogurt all over the chicken pieces, being sure to rub it into the slits. Set the chicken aside to marinate, on the countertop, for 30 minutes.
6 boneless, skinless chicken breasts
In a large cast iron skillet, heat the butter and oil over medium-hot heat.
2-4 tbsp salted butter, 2-4 tbsp olive oil
Add the chicken pieces, one-at-a-time, to the hot pan. Don’t crowd the chicken. Cook 1½-2 minutes, or until the skillet side is golden brown. Flip the chicken over, cook 2 minutes, and repeat this process approximately 10-12 minutes or until the chicken is cooked through. A meat thermometer should register 160°F for white meat and 165°F for dark meat, when tested in the thickest part of each piece. The different chicken pieces will take different times to cook. (White meat cooks more quickly than dark meat.)
As each chicken piece finishes cooking, transfer it to a large, heatproof bowl.