Preheat oven to 425°F.
Whisk together the garlic, the lemon juice, crushed red pepper, cumin, olive oil, salt, and pepper. Divide in half and mix half with the chicken and half with the bell pepper and pineapple.
If possible, allow the chicken, bell pepper, and pineapple to marinate in the refrigerator for about 30 minutes.
Skewer chicken, bell pepper, and pineapple on ten wooden skewers and set on a foil lined baking tray and bake for about 15 minutes or until chicken is cooked through.
Serve warm and enjoy!