Meanwhile, in a bowl, stir together yogurt and dip mix.
Dice tomatoes, then place in a separate bowl. Stir in seasoning, 1 tbsp oil, salt and pepper.
Lightly brush both sides of naan breads with oil. Place yogurt, tomatoes, oiled bread and cheese on a Sheet Pan and head to the grill!
Place bread on grill. Barbecue until one side is lightly charred, 2 min. Remove from grill; spread grilled sides with yogurt mixture, then top with tomatoes and cheese.
Place back on grill; close lid and barbecue until cheese melts, 1–2 min.