Preheat oven to 400 degrees.
Chop potatoes and squash into thin disks.
Spray a large cookie sheet with cooking spray.
In a large bowl, combine chicken, potatoes, and squash.
Drizzle with olive oil (about 3 rotations of drizzle) and stir.
On the baking sheet, place the chicken on one end.
On the other side, add the squash and the potatoes. (Try to place them only one layer deep as much as possible.)
In a small bowl, combine the ranch mix and all of the spices.
Spoon the spices over the entire sheet pan, careful to evenly coat all areas of the pan.
Bake for 22-30 minutes or until chicken is cooked through and the veggies pierce easily with a fork.
Garnish with parsley and additional spices, if desired.