Preheat your oven to 375 degrees F.
In a baking pan, place around 3 big handfuls for spinach and even it out in the bottom of the pan.
Place the sliced tomatoes on top of the spinach.
Place the chicken on top of the tomatoes, then season the chicken on both sides well with garlic salt and pepper.
In a separate small bowl, add the yogurt, Parmesan, garlic, lemon juice, and the spicy seasoning and mix well.
Pour the mixture over the chicken and make sure the chicken is completely coated.
Bake for 35-45 minutes until chicken is cooked through. Baking time depends on how thick your chicken is.