Creating Chili and Brown Sugar Spice Rub Chicken and Sweet Potatoes is straightforward if you follow these steps:

1. Preheat Oven: Preheat your oven to 400°F (200°C).
2. Prepare Chicken: Pat the chicken thighs dry with paper towels and place them in a large mixing bowl.
3. Make Spice Rub: In a small bowl, mix together the brown sugar, chili powder, garlic powder, onion powder, smoked paprika, salt, and black pepper.
4. Coat Chicken: Rub the spice mixture all over the chicken thighs, ensuring even coverage.
5. Prep Sweet Potatoes: In another bowl, toss the cubed sweet potatoes with olive oil, salt, and pepper until well coated.
6. Arrange on Baking Sheet: Spread the seasoned sweet potatoes around the chicken on a large baking sheet.
7. Bake: Place the baking sheet in the preheated oven and bake for 45-50 minutes, or until the chicken is cooked through and the sweet potatoes are tender.
8. Check Doneness: Ensure the chicken reaches an internal temperature of 165°F (75°C) and the sweet potatoes are fork-tender.
9. Garnish: Remove from the oven and let it rest for a few minutes. Garnish with fresh cilantro if desired.
10. Serve: Plate the chicken and sweet potatoes, ready to be enjoyed!

These simple steps will guide you to create this incredible dish with ease.