Simple and delicious Mediterranean chicken kebabs

Name: Simple and delicious Mediterranean chicken kebabs
Cuisine: Mediterranean
Ingredients: 3 chicken filets, diced; 2 red bell peppers; 2 green bell peppers; 1 red onion; 140ml virgin olive oil; 1 lemon; 6 cloves garlic, divided; 2 tsp paprika; 2 tsp thyme; 4 tsp oregano; 4 tsp salt; 2 tsp freshly ground black pepper