Creamy Pasta with Tomatoes

Boil the penne pasta in salted water according to package instructions until al dente. Reserve one cup of the pasta water before draining.

While the pasta is cooking, finely chop the onion and garlic. In a large pan, heat the olive oil and butter over medium heat.

Sauté the onion until translucent, then add the garlic and chili flakes. Cook for another minute until the aromas are released.