Keep your kitchen cool and comfortable with grilled meals that banish the heat to the outdoors. Zesty mustard, spicy Sriracha and rich buttermilk lend a marinated flavor upgrade to traditional grilled chicken.
In medium bowl, whisk buttermilk, mustard powder, Sriracha, garlic and paprika.
Place chicken in large zip-top bag; pour buttermilk mixture over chicken. Seal bag and refrigerate 2 hours or overnight.
Heat outdoor grill for direct grilling over medium heat. Remove chicken from marinade, shaking off excess; discard marinade. Lightly oil grill grates. Transfer chicken to grill and cook, turning occasionally, 16–18 minutes, or until internal temperature reaches 165 degrees.
Transfer chicken to serving platter. Sprinkle with parsley and serve with lemon wedges, if desired.