Italian Sausage Rigatoni with Spicy Tomato Cream Sauce

INGREDIENTS

1 tbsp

olive oil

1 tbsp

unsalted butter

medium onion , sliced thin

1 lb

Italian sausage , casings removed

medium garlic cloves , chopped

2/3 cup

chicken broth

( 14.5 ounce ) can diced tomatoes , undrained

1 cup

heavy cream

1/4 cup

fresh chopped basil or parsley

1/2 tsp

kosher salt

1/2 tsp

freshly cracked black pepper , or to taste

1/2 tsp

dried red pepper flakes , or to taste

1/2 tsp

Cajun seasoning (like Slap Ya Mama ), or to taste, optional

8 oz

rigatoni pasta , cooked

1/2 cup

freshly shredded Parmesan , plus more for garnish