Boil a large pot of salted water and cook the pasta al dente; reserve 1/2 cup pasta water.
In a pan, heat olive oil and sauté onion and garlic until softened.
Slice the chicken sausage into coins and add to the pan, frying until browned.
Sprinkle in Italian seasoning and chili flakes.
Deglaze the pan with vodka, add tomato paste and cream/almond milk, simmer until thickened.
Stir in spinach and sun-dried tomatoes until wilted.
Fold the cooked pasta into the sauce, adding pasta water to adjust consistency.
Mix in the grated Parmigiano, season with salt and pepper, and serve immediately.