Barbecue Chicken Skewers (The Best)

Ингредиенты

• ½ cup (125 ml) buttermilk
• 1 tsp onion powder
• 1 tsp garlic powder
• ½ tsp ground allspice
• ½ tsp cayenne pepper
• 1 ½ lb (675 g) boneless, skinless chicken breast, cubed
• 6 green onions, cut into 1 ½-inch (4 cm) pieces (optional)
• Vegetable oil, for brushing
• ¼ cup (60 ml) ketchup
• 2 tbsp (30 ml) water
• 1 tbsp (15 ml) tomato paste
• 1 tbsp (15 ml) maple syrup
• 1 tsp sweet paprika
• ½ tsp ground coriander
• ¼ tsp ground allspice