Cook pasta according to package directions.
Meanwhile, heat olive oil in a large skillet over medium-high heat. Add in sliced mushrooms and saute 3 minutes, until mushrooms are tender.
Add in crushed garlic and let heat 1 minute.
Stir in cooked pasta, marinara and crushed red pepper flakes.
Pour in tomatoes and spinach. Stir to combine. Stir in heavy cream.
Serve hot sprinkled with parmesan cheese.
