Step 1: Preheat Oven: Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper or lightly grease it with oil to prevent sticking.
Step 2: Make the Maple Glaze: In a small bowl, whisk together maple syrup, Dijon mustard, minced garlic, thyme, smoked paprika, salt, and pepper until well combined. Set aside.
Step 3: Prep the Sweet Potatoes: Place the cubed sweet potatoes and onion wedges (if using) on the prepared baking sheet. Drizzle with olive oil, sprinkle with salt and pepper, and toss to coat evenly.
Step 4: Arrange the Chicken: Pat the chicken dry with paper towels. Place it on top of the sweet potatoes, skin side up. Brush each piece generously with the maple glaze.
Step 5: Roast and Baste: Roast in the preheated oven for 45–55 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the skin is crisp. Halfway through, baste the chicken with extra glaze and give the sweet potatoes a quick toss.
Step 6: Finish and Serve: Remove from the oven and let rest for 5 minutes. Drizzle any remaining glaze or pan juices over the chicken and sweet potatoes before serving.