Step 1

Bring a large pot of lightly salted water to a boil. Add penne and cook, stirring occasionally, until tender yet firm to the bite, about 11 minutes. Drain, reserving 1 cup of cooking water.

Step 2

Heat olive oil in a large skillet over medium heat and cook onion until soft and translucent while penne is cooking, about 5 minutes. Add garlic and cook an additional 30 seconds. Stir in tomato sauce and tomato paste and cook until slightly reduced, about 5 minutes. Add cream and Parmesan cheese and season with salt, pepper, and sugar.

Step 3

Preheat oven to 400 degrees F (200 degrees C). Grease a baking dish.

Step 4

Stir some pasta cooking water into the sauce and add cooked penne. Remove from heat and stir in cherry tomatoes, 1/2 the mozzarella cheese, and basil. Pour penne mixture into the prepared baking dish and cover with remaining mozzarella cheese.

Step 5

Bake in the preheated oven until cheese is melted, about 20 minutes.