Preheat oven to 400ºF. Then, spray a baking sheet with nonstick cooking spray.
Prepare an oil for the sheet pan meal by adding the olive oil, maple syrup, and minced garlic to a small bowl and mix. Set aside.
Next, season the chicken thighs with the chicken seasoning. Be sure to cover the whole chicken thigh with seasoning. Place the chicken thighs in a line down the middle of the greased baking sheet. Let the chicken sit in the dry rub while the vegetables are being prepared.
Sprinkle the cauliflower and onion on one side of the chicken thighs and the chopped sweet potato and garlic head on the other side of the chicken.
Carefully drizzle the oil and maple mixture over the vegetables. Mix the vegetables so that they are all covered in oil.
Lastly, sprinkle the salt, pepper, and garlic powder over the vegetables.
Place the baking sheet in the oven and bake at 400ºF for 20 minutes.
Remove the baking sheet from the oven and toss the vegetables.
Place the baking sheet back in the oven and bake for an additional 15 minutes. Sprinkle parmesan over the vegetables and bake for 3 additional minutes or until the parmesan cheese is melted.
Remove from the oven and enjoy.