Preheat oven to 400 degrees F. Coat a large baking sheet with nonstick cooking spray.
Arrange chicken thighs, potatoes and carrots in a single layer on the baking sheet.
In a small bowl, whisk together olive oil, ranch seasoning, garlic, brown sugar, paprika, salt and pepper. Spread all over the chicken thighs and veggies with a pastry brush.
Bake until chicken is cooked through and veggies are tender, 25-30 minutes. Once cooked, set your oven to Broil, and place back into oven for 2-3 minutes, or until caramelized and slightly charred.
Remove from oven and sprinkle with chopped parsley. Serve immediately.