3. Step
Meanwhile, heat oil in a large ovenproof skillet over medium-high heat. Add onion, mushrooms and salt and cook, stirring often, until the onion is softened but not browned, about 5 minutes. Add wine and cook until evaporated, 4 to 5 minutes. Sprinkle flour over the vegetables; stir to coat. Add milk and pepper and bring to a simmer, stirring constantly. Stir in tuna, peas and 1/2 cup Parmesan until evenly incorporated. Then, stir in the noodles (the pan will be very full). Remove from the heat.