Step 1: Prepare the Marinade

1. Combine Ingredients: In a large mixing bowl, add the yogurt, olive oil, minced garlic, lemon juice, and tomato paste.
2. Season: Add the paprika, ground cumin, ground coriander, ground cinnamon, salt, and pepper to the mixture.
3. Mix Well: Stir all the ingredients together until fully combined, creating a smooth marinade.

Step 2: Marinate the Chicken

1. Add Chicken: Place the chicken cubes into the bowl with the marinade, ensuring each piece is well-coated.
2. Cover and Refrigerate: Cover the bowl with plastic wrap or a lid, and refrigerate for at least 2 hours, or overnight for best results. This allows the flavors to permeate the chicken fully.

Step 3: Prepare for Grilling

1. Soak Skewers: If using wooden skewers, soak them in water for 30 minutes to prevent burning during grilling.
2. Preheat Grill: Preheat your grill to medium-high heat.

Step 4: Skewer the Chicken

1. Assemble Skewers: Thread the marinated chicken pieces onto the skewers, leaving space between each piece for even cooking.

Step 5: Grill the Chicken

1. Grill Skewers: Place the skewers on the preheated grill. Cook for 10-15 minutes, turning occasionally, until the chicken is fully cooked and has a charred exterior.
2. Check Doneness: Ensure the internal temperature of the chicken reaches 165°F (75°C).

Step 6: Serve

1. Plate and Enjoy: Remove the chicken from the skewers and serve hot with your choice of sides.