For the Chicken

• 700 g boneless, skinless chicken thighs or breast, cut into bite-sized pieces
• ½ cup plain Greek yogurt or thick plain yogurt
• 2 tbsp olive oil
• 2 tbsp lemon juice
• 4 cloves garlic, minced
• 1 tsp paprika
• 1 tsp ground cumin
• 1 tsp dried oregano
• ½ tsp ground black pepper
• 1 tsp salt
• ½ tsp red pepper flakes, optional

For the Skewers

• 1 large red onion, cut into chunks
• 1 red bell pepper, cut into chunks
• 1 green bell pepper, cut into chunks
• Wooden or metal skewers