Heat olive oil in a large pot or Dutch oven over medium-high heat. Add diced sweet potato, minced garlic, and diced onion. Cook for 8-10 minutes until sweet potatoes soften and onions are translucent.
Add penne pasta, ground sage, thyme, and vegetable broth to the pot. Bring to a boil and let it simmer for about 10-11 minutes, stirring often.
Once pasta is nearly cooked, lower the heat to a gentle simmer. Stir in parmesan cheese, heavy whipping cream, salt, and pepper, and cook for 3-6 minutes until the sauce thickens.
Add chopped spinach and cook for 1-2 minutes until wilted. Serve garnished with extra parmesan if desired.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.