Butterfly the turkey breast. Start on the thick rounded side and make a horizontal cut through the middle to within one inch of the other side. Try not to create any holes.
Brine the turkey breast. Combine hot tap water, sugar and kosher salt in a large bowl. Mix well and wait for the water to clear and the sugar and salt to dissolve. Place turkey breast in the brine and refrigerate for 4-6 hours.
Preheat oven to 350 degrees.
Remove turkey from the brine, pat dry and spread out flat. Gently pound it out to flatten it some more. Season with salt and black pepper.
Combine shallot, ricotta, Parmesan, spinach, Italian seasoning, salt and black pepper to taste in a small bowl.
Spread stuffing ingredients over the inside of turkey breast to within 1-inch of the edge.
Roll up to enclose the filling. Smooth the skin over the top of the breast. Secure with butcher’s twine.
Place the turkey breast in a roasting pan. Dot the top with butter and drizzle with olive oil. Season with salt and black pepper.
Bake for 1 to 1 1/2 hours or until an instant-read thermometer registers at least 160 degrees in the center. Baste or brush the turkey breast at least twice with the pan drippings while it's baking.
Tent and let rest 5-10 minutes. Slice into 1/2-inch slices and serve with sauce.