1-Step 1: Prepare Your Ingredients First, get everything ready by chopping the bell peppers, mincing the garlic, and choosing your sausage type. This prep work only takes about 10 minutes and sets the stage for smooth cooking.

2-Step 2: Cook the Pasta Boil a large pot of salted water and cook the pasta al dente according to package instructions. Once done, drain it but save a bit of the pasta water for later it helps blend the flavors perfectly.

3-Step 3: Brown the Sausage In a skillet over medium-high heat, brown the sausage, breaking it up for about 8-10 minutes, then transfer it to a paper towel-lined plate to drain any excess fat.

4-Step 4: Sauté the Vegetables Add the olive oil, onion, and chopped bell peppers to the skillet; cook until the onion is lightly browned and the peppers are soft, about 7-8 minutes.

5-Step 5: Build the Sauce Reduce the heat to medium; add the butter and garlic, melt the butter, then sprinkle in the flour and cook for about one minute while stirring. Stir in the cream and Dijon mustard, cooking briefly until the sauce thickens slightly.

6-Step 6: Combine Everything Return the cooked sausage and spinach to the skillet, stirring to combine. Add a few tablespoons of reserved hot pasta water, then toss in the drained pasta until the spinach wilts and everything is coated with sauce. Season with salt and pepper to taste, and serve immediately. Top with parmesan cheese if desired.