In a large pot, bring salted water to a boil and cook the rigatoni according to package instructions until al dente. Drain and set aside.
While the pasta is cooking, heat olive oil in a large skillet over medium-high heat. Add the steak tips, season with salt, pepper, and paprika, and sear for about 3-4 minutes until browned on all sides. Remove the steak from the skillet and set aside.
In the same skillet, reduce the heat to medium and add 2 tablespoons of butter. Once melted, add minced garlic and sauté for about 1 minute until fragrant.
Pour in the beef broth and bring to a simmer, scraping the bottom of the skillet to deglaze. Let it cook for about 2-3 minutes.
Stir in the heavy cream and bring the mixture back to a simmer. Cook for another 2-3 minutes until slightly thickened.
Add the cooked rigatoni, steak tips, and remaining 2 tablespoons of butter to the skillet. Stir to combine.
Remove from heat and mix in the mozzarella and Parmesan cheese until melted and creamy.
Serve immediately, garnished with chopped parsley.