Preheat oven to 350 degrees. Prepare a 9" x 13" baking dish by spraying with non stick baking spray.
Add cracker crumbs, garlic salt, seasoned salt, parsley flakes and 3 Tbsp. Parmesan cheese in a shallow dish and mix.
Coat each side of chicken breast with plain Greek yogurt. Then roll in cracker mixture until completely coated. Set in a single layer in prepared baking dish.
Slice butter into 16 equal slices. Add two slices to the top of each chicken breast.
Bake uncovered for 45 minutes. Check chicken after 30 minutes of baking. If it's completely browned cover with aluminum foil for the remainder of baking time.
If desired sprinkle additional grated Parmesan cheese and chopped parsley over chicken before serving.