Bring a large pot of salted water to a boil. Add the 12 oz penne pasta and cook according to package instructions until al dente. Drain the pasta and set aside.
In a large skillet, heat 2 tablespoons of olive oil over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant, being careful not to burn it.
Add the peeled and deveined shrimp, season with salt, pepper, and 1 teaspoon Italian seasoning. Cook the shrimp for 2-3 minutes per side until pink and opaque. Remove from heat.
In the same skillet, pour in 1 cup heavy cream and heat gently over medium-low heat. Slowly whisk in 1 cup grated Parmesan cheese until melted and smooth. Season with additional salt and pepper if desired.
Add the cooked penne pasta and sautéed shrimp into the skillet with the Alfredo sauce. Toss everything together until evenly coated.
Transfer the shrimp and pasta mixture into a greased 9x13 inch baking dish. Sprinkle 1 cup shredded mozzarella cheese evenly over the top.
Preheat your oven to 375°F (190°C). Bake the pasta for 15-20 minutes, or until the cheese is melted, bubbly, and slightly golden on top.
Remove from the oven and sprinkle 2 tablespoons of chopped fresh parsley over the top. Serve hot and enjoy!