Begin by preheating the oven to 375 F.
Brown the sausage in a pot on medium-high heat. Once done, remove the sausage, leaving the grease.
Add butter to the pot, sauté onions, garlic, poultry seasoning, salt, and pepper.
Combine chicken stock, egg, parsley, sausage, and bread cubes. Set aside.
For the turkey, mix softened butter with all other listed ingredients. Coat the turkey under and on top of the skin with the seasoned butter.
Line a baking sheet with parchment paper. Cover half of the sheet with the stuffing, leaving space for the turkey breast.
Hasselback the sweet potatoes, placing them on the sheet and brushing with a mixture of melted butter and brown sugar.
Bake for 40 minutes.
In the meantime, toss the green beans with olive oil, garlic, salt, and pepper.
Add the beans to the baking sheet along with the rolls and marshmallows atop the sweet potatoes. Bake for an additional 20 minutes. If needed, cover the turkey and stuffing with foil.