2Cook the whole wheat pasta according to the package instructions. Drain and set aside.
While the pasta is cooking, heat the olive oil in a large pan over medium heat.
Add the chopped onion and red bell pepper to the pan. Sauté until the vegetables are soft, about 5-7 minutes.
Add the minced garlic and red chili flakes to the pan. Cook for another 1-2 minutes until fragrant.
Pour in the tomato sauce and stir to combine. Let it simmer for 5 minutes.
Add the milk to the sauce and stir well. Let it cook for another 2-3 minutes until the sauce is well combined and slightly thickened.
Season the sauce with salt and black pepper to taste.
Add the cooked pasta to the sauce and toss to coat evenly.
Serve the pasta hot, garnished with fresh basil leaves.