Cook the pasta: cook the pasta 1 minute shorter than the package instructions. Drain and set aside.
Preheat the oven to 375°F (190°C).
Make the mushroom sauce:
Cut the mushrooms into thick slices, dice the onions, finely chop the garlic with a knife.
Cook the mushrooms: Heat the oil in a large frying pan over medium-high/high heat. Add the mushrooms in an even layer and cook without stirring for 1-2 minutes letting the mushrooms at the bottom brown. Then start stirring - the mushrooms will release water. Stir them from time to time (not too often) for a couple of minutes or until all the water is evaporated. Spread them in an even layer and cook without stirring for 1-2 minutes letting the mushrooms brown again. The mushrooms should be brown (at least some of them) and still a little bit firm (not too soft). Transfer the mushrooms to a plate.
Reduce the heat to low and add onions, cook for 3-4 minutes or until soft. Add butter (2 tablespoons), garlic, and thyme. Cook for 30 seconds.
Whisk in the flour and cook for a minute.
Add wine and cook until almost evaporated.
Add broth, milk, heavy cream, Dijon mustard, and lemon juice (if your pan is not big enough you may need to transfer all the ingredients to a pot). Bring gently to a boil then cook for 2-3 minutes. Season to taste with salt and pepper. You may think that the sauce is too runny but it will all thicken in the oven.
Assemble the casserole: Add the sauce, cooked spaghetti, cooked turkey, peas, mozzarella cheese, and cooked mushrooms to a 9x13 inch (23x33cm) casserole dish. Check if the casserole needs more salt and pepper. Toss to combine.
Make the crunchy topping: melt the butter (3 tablespoons) in a small pot, add the breadcrumbs and stir to coat. Take the pot off the heat and stir in parmesan cheese.
Top the casserole with 2 cups of shredded Swiss cheese and crunchy topping.
Bake for about 25-30 minutes or until the topping is golden and the casserole is bubbling.
Let rest for 5 minutes then serve.
Enjoy!
uwagi
Calories = 1 serving (1/6 of the recipe). This is only an estimate!