Cook the Pasta – Bring a large pot of salted water to a boil. Cook the penne pasta until al dente, then drain and set aside.
Sauté Aromatics – In a large skillet, heat olive oil and butter over medium heat. Add the chopped onion and cook until softened. Stir in garlic and red pepper flakes, cooking for another minute.
Deglaze with Vodka – Pour in the vodka and let it simmer for about 30 seconds, allowing the alcohol to cook off.
Add Tomato Paste – Stir in the tomato paste, cooking for 2 minutes until it deepens in color and caramelizes slightly.
Stir in Cream – Reduce the heat to low, then slowly pour in the heavy cream. Stir continuously until smooth and well combined.
Combine with Pasta – Add the drained penne to the skillet and toss to coat in the sauce. If the sauce is too thick, add a splash of reserved pasta water.
Finish & Serve – Stir in parmesan cheese, season with salt and black pepper to taste, and garnish with fresh basil. Serve immediately.