01 -
Heat olive oil in a large skillet over medium heat. Add sliced beef sausage and cook for 5 to 6 minutes, turning occasionally, until evenly browned. Remove the sausage from the skillet and set aside.
02 -
Using the same skillet, add minced garlic and crushed red pepper flakes. Sauté for about 1 minute until aromatic, avoiding browning.
03 -
Pour heavy cream into the skillet and bring to a gentle simmer. Add grated Parmesan cheese, salt, black pepper, and Italian seasoning. Whisk until the cheese is fully incorporated and the sauce is smooth.
04 -
Return the browned sausage to the skillet. Simmer for 2 to 3 minutes to allow flavors to meld.
05 -
Stir cooked rotini into the skillet, ensuring each piece is coated with sauce. Fold in baby spinach, if using, and stir just until wilted. Serve immediately.