Preheat oven to 400℉.
Line a cookie sheet with foil. Set aside.
In a mixing bowl combine mayonnaise, Parmesan cheese, and Ranch seasoning. Stir to combine. Set aside.
Cut potatoes evenly into bite sized pieces and place them in a mixing bowl.
Add a third of the sauce to the bowl and stir to coat the potato pieces.
Spread potatoes out onto the prepared cookie sheet in a single layer.
Bake for 20 minutes.
While potatoes are in the oven, prepare the pork chops.
Rinse pork chops under cold water and pat dry with a paper towel.
Season with salt and pepper.
Top each pork chop with a generous layer of the sauce and sprinkle with stovetop stuffing crumbs.
Prepare Brussels sprouts; trim off outer leaves and cut them in half.
Place them the same bowl used to prepare potatoes.
Add the remaining sauce to the bowl and stir to coat.
Add a handful of stovetop stuffing mix and stir to combine.
Remove potatoes from the oven and use a spatula to stir potatoes, flipping them over on the sheet pan.
Add the prepared pork chops to the sheet pan next to the potatoes.
Spread Brussels sprouts out onto the remaining third of the sheet pan in a single layer.
Top potatoes and Brussels sprouts with any remaining cornbread stuffing crumbs.
Spray everything with cooking spray.
Return sheet pan to the oven and cook for another 20-25 minutes, or until potatoes and Brussels sprouts are tender and the pork chops reach an internal temperature of 145℉.
Remove from oven and serve immediately.