01 -
Heat olive oil in a large skillet over medium-high heat. Add the diced onion and 1 teaspoon of salt, cooking for about 5 minutes until the onion becomes soft and translucent.
02 -
Pour in the heavy cream, stirring frequently, and let it simmer for 5 minutes until slightly thickened.
03 -
In a small bowl, whisk 1 tablespoon of flour with 3 tablespoons of water until smooth. Gradually stir this mixture into the sauce and cook for an additional 5 minutes, allowing it to thicken further.
04 -
Reduce the heat to low and stir in the Parmesan, mozzarella, and garlic powder. Let the sauce simmer for 3-5 minutes, until the cheese is fully melted and incorporated. If desired, add a sprinkle of freshly chopped parsley for extra flavor.
05 -
Add the cooked macaroni to the skillet, tossing to coat each piece in the creamy sauce.
06 -
Remove the skillet from heat and stir in the pesto sauce until evenly mixed.
07 -
Garnish with more parsley or a sprinkle of Parmesan, and serve immediately.