Marinate chicken in 3/4 cup of the Mrs. Dash® Lime Garlic Marinade for at least 10 minutes. Separately, marinate vegetables in 1/2 cup Mrs. Dash® Lime Garlic Marinade, for at least 10 minutes. Preheat barbeque grill to medium high heat. Remove chicken breasts from marinade, discarding marinade. Grill chicken 5-6 minutes per side or until chicken is cooked through, brushing with remaining 1/4 cup fresh marinade. Remove squash and onion from marinade; discarding marinade. Grill vegetables 4-5 minutes per side. Serve each chicken breast with sliced vegetables.