1) In a large skillet melt the butter over medium heat.
Add the onion and garlic and cook for a couple minutes until the onion
softens.
2) Stir in the mushrooms and season with salt, pepper, Italian seasoning
and red pepper flakes.
Cook for about 5 minutes until the mushroom cook down a bit and start to
brown.
3) Sprinkle the flour over the mushrooms and stir. Stir in the chicken
broth and milk.
Add the mafalda pasta, stir and cook for about 8 to 10 minutes or until
the pasta is cooked through.
There should be enough liquid but if you find that the pasta is not
cooked enough and all the liquid is gone, add a bit more chicken broth.
4) Stir in the ricotta and Parmesan cheese, then add the spinach and
stir.
Cook for another minute until the spinach cooks down.
5) Stir in the chicken and sprinkle with mozzarella cheese.
Place the skillet under the broiler for a couple minutes to melt the
cheese.