In the same skillet, add the remaining 1 tablespoon of olive oil.
Add the chopped onion, minced garlic, and sliced bell peppers.
Sauté the vegetables until they become tender, about 5 minutes.
Stir in the red pepper flakes and cook for an additional minute.
Pour in the heavy cream and tomato sauce, then stir to combine.
Bring the sauce to a simmer and let it cook for 5 minutes, allowing it to thicken.