In a small bowl, whisk together olive oil, balsamic vinegar, fresh rosemary, and ground black pepper.
In a large bowl, pour mixture onto chicken breasts, brussels sprouts, and yellow potatoes and toss to coat.
Place coated chicken breasts, brussels sprouts, and yellow potatoes onto prepared baking sheet. Roast in oven for 20-30 minutes, or until chicken breasts reach an internal temperature of at least 165 degrees Fahrenheit and brussels sprouts and potatoes can be easily pierced with a fork.https://amzn.to/2TpuRZY
Notes
For a richer flavor and ultra tender chicken breasts, place the chicken and half the marinade in a covered storage container or silicone storage bag and allow to marinate at least overnight.
If using dried rosemary instead of fresh, use 1/3 the amount listed.
Try this recipe with red, fingerling, russet, sweet, or your other favorite potato!