Preheat oven to 400 F. Line a rimmed baking sheet with silicone baking mat.
In a large bowl, whisk together the honey, mustard and vinegar. Cut the chicken into 1-inch, bite-size pieces and add to the honey mustard sauce. Marinate in the fridge until the veggies are ready.
Peel and cut the sweet potatoes, slice the zucchini, cut the red onion.
Add the coated chicken and the veggies onto the baking sheet and spread into an even layer. Roast in the preheated oven for 40 to 45 minutes.
Remove from oven and let cool slightly before serving. Drizzle hot honey over the top of the roasted chicken and veggies, and season with salt and pepper to taste. Enjoy!