Heat olive oil in a large pot over medium-high heat. If using pancetta, add and cook for about 5 minutes until crisp.
Add chopped onion and minced garlic. Sauté for about 5 minutes until soft.
Stir in crushed red pepper flakes and tomato paste; cook for another 2 minutes.
Pour in tomato sauce and crushed tomatoes, add salt, and bring to a gentle simmer. Cook uncovered for 20-30 minutes.
Meanwhile, boil salted water and cook ziti until al dente. Drain and return to the pot.
Add two-thirds of the sauce to the ziti; toss to coat. Reserve the remaining sauce.
In a small bowl, mix mascarpone cheese with grated garlic and a pinch of salt.
Preheat oven to 400°F. In a 9x13-inch baking dish, layer half of the saucy ziti, dollops of mascarpone, half of the mozzarella, and half of the provolone. Spoon about 1 cup of reserved sauce over.
Add remaining ziti, top with remaining mozzarella and provolone, and spoon the leftover sauce over.
Bake for about 20 minutes until cheese is melted and bubbly.
Optional: Garnish with grated Parmesan, basil, or black pepper before serving.
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Notes
Store leftovers in an airtight container in the fridge for 3-4 days. Reheat in the oven or microwave.