Mix yogurt, ginger, paprika, garam masala, garlic and salt in a medium bowl until blended. Scrape 3⁄4 cup into a 1-gallon ziptop bag. Add chicken; seal bag and turn to coat. Refrigerate at least 30 minutes. Stir cilantro into remaining yogurt mixture and set aside for serving.
Meanwhile, heat broiler and line a rimmed baking sheet with nonstick foil.
Remove chicken from bag and place on prepared pan (discard bag and its contents). Broil 10 to 12 minutes, turning once, until cooked through.