Step 1

In a large sauce pan or dutch oven, heat olive oil over medium high heat.

Step 2

Add in onion and saute until translucent. Add in garlic for a quick minute until fragrant.

Step 3

Add in the rest of the ingredients, from the pasta to the red pepper flakes, and stir until everything is combined.

Step 4

Cover with lid and bring to boil.

Step 5

Once boiling, lower heat to medium-low and cook for 15-20 minutes, stirring occasionally, until most of the liquid is absorbed. There can be a little liquid left as it will thicken as it continues to sit, but you don’t want it to be soup-y.

Step 6

Turn off the heat and add in bag of spinach. Stir and cover with lid. Let sit for 5 minutes. Stir and at this time most of the liquid should be absorbed.

Step 7

Top with freshly grated parmesan cheese.