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In a bowl, stir together oil, lemon juice, soy sauce, balsamic vinegar, brown sugar, garlic, salt, and pepper. Pierce chicken breasts with a fork all over. Place in a large Ziploc bag. Pour marinade over chicken. Let marinate for at least 30 minutes. 4 - 5 hours is ideal.
Preheat grill to medium heat. Brush grill with oil to prevent sticking.Place chicken on the grill. Cook for approximately 5 - 6 minutes per side, depending on the thickness of chicken. The internal temperature of the chicken should reach 165 degrees. Remove chicken from grill and let rest for 5 minutes.
Cook bacon until crispy. Set aside.
Spread mayonnaise on brioche buns. Spread avocado on one side. Top with chicken, bacon, tomatoes, lettuce, and red onion.
Nutrition information is automatically calculated, so should only be used as an approximation.
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