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.