Step 1

Heat a large skillet (one with a lid) over medium to medium-high heat, and add the smoked sausage. Saute until browned well — if you need a little oil because it starts to stick, add a drizzle. Remove from the pan, and set aside.

Step 2

In the same skillet over medium heat, add the olive oil and onion. Saute until tender, about 5 minutes. Add the garlic, and cook until fragrant, about 30 seconds.

Step 3

Add the broth, and scrape the pan to loosen any browned bits.

Step 4

Add the diced tomatoes, water, dry pasta, salt, and pepper. Stir to combine well.

Step 5

Bring the mixture to a simmer, add the lid, and simmer, stirring occasionally, until the pasta is cooked through, about 15 minutes.

Step 6

Stir in the shredded cheese, red pepper flakes if using, and the spinach. Stir to combine until the cheese is melted.

Step 7

Return the sausage to the pan and stir to combine.

Step 8

Serve right away!