Combine oil, 1/4 cup lemon juice, soy sauce, minced garlic, oregano, 1/4 teaspoon salt, and 1/4 teaspoon pepper in a large Ziploc bag.

Cut 2-4 chicken breasts into large bite-sized chunks and place chicken in the bag. Make sure all pieces are covered. Put chicken in fridge and let marinate for at least 3 hours, and up to overnight.

If using wooden skewers, let your skewers soak in water for at 15-30 minutes to prevent burning. Cut bell pepper, zucchini, onion and pineapple into large chunks. Alternate skewering all ingredients onto your sticks.

Turn on grill to medium heat. Place skewers on grill and cook for 7-8 minutes per side or until chicken is no longer pink in the middle (if using a meat thermometer, make sure it registers 165 degrees).  Remove from grill and serve!