In a large pot of boiling salted water, cook the penne pasta according to the package instructions until al dente. Drain and set aside.
In a large skillet, heat the olive oil over medium heat. Add the minced garlic and sauté for 1 minute until fragrant, being careful not to burn it.
Pour in the crushed tomatoes and stir. Add dried oregano, salt, and pepper to taste. Let the sauce simmer for about 10 minutes until it thickens slightly.
Add the cooked penne pasta to the skillet with the tomato sauce. Toss until the pasta is well coated in the sauce.
Remove the skillet from heat and stir in the diced mozzarella, allowing it to melt slightly with the residual heat.
Preheat your oven to 180°C (350°F). Transfer the pasta mixture to a baking dish and sprinkle the grated Parmesan cheese evenly on top. Bake in the preheated oven for 15-20 minutes, or until the cheese is bubbly and golden brown.
Remove from the oven and let cool for a couple of minutes. Garnish with fresh basil leaves before serving.
Notes
For extra flavor, you can add red pepper flakes to the sauce.