Place a pizza stone in the oven and turn heat to its highest setting. Let it heat for at least an hour.
Meantime cook the variety of mushrooms, saute in 1 tbsp truffle oil and sprinkle with truffle salt. Cook the mushrooms until crispy.
Put the sauce in the center of the stretched dough and use the back of a spoon to spread it evenly across the surface, stopping approximately 1/2 inch from the edges.
Scatter the cooked chicken sausage slices, mushrooms, and red onion on top. Place a little more cheese on top.
Bake in a 425 degree oven for about 10 minutes or until the crust begins to brown and the cheese bubbles.
Right before serving, sprinkle the top with freshly grated Parmesan.
