sausage and mushroom pasta

This is one of my favorite pasta dishes that I have come up with. It's simple and delicious!

1 box of pasta
1 lb of italian sausage (remove from casings)
1 onion (I like sliced to match the pasta)
1 pkg of mushrooms, sliced
1-2 garlic cloves, minced
1 bag of baby spinach
olive oil
salt and pepper
pasta water
parmesan cheese

• Start the water boiling for the pasta, add salt and cook pasta according to box directions
• heat another pan to med high heat, drizzle with olive oil
• saute the onions for about 5-10 minutes
• add mushrooms and cook about 5 more minutes
• add spinach and garlic and cook until spinach starts to wilt
• add sausage, cook until sausage is no longer pink, turn to low and cover
• add the pasta when it is done cooking, add some pasta water to make a nice sauce
• serve and sprinkle with parmesan

I had a friend substitute with ground pork, and it is not the same. The sausage gives it all the flavor.