Bring a large pot of salted water to a boil. Add the spaghetti and cook according to the package instructions until al dente, about 8-10 minutes. Drain, reserving about ½ cup of pasta water.

In a large skillet, heat unsalted butter and olive oil over medium heat. Add the minced garlic and sauté for 1-2 minutes, or until fragrant and golden brown. Be careful not to burn the garlic.

Lower the heat, then add the Parmesan cheese and mozzarella cheese to the skillet. Stir until the cheeses melt and combine into a creamy sauce. Add the reserved pasta water gradually, stirring to adjust the sauce’s consistency to your liking.

Add the cooked spaghetti to the skillet, tossing to coat the pasta in the cheesy garlic sauce. Season with salt and pepper to taste.

Plate the pasta and garnish with chopped fresh parsley and extra Parmesan cheese.