Add the white sauce, mix and continue to cook for 2 more minutes or till the veggie pasta sauce comes to a boil. Brown the butter in a large skillet over medium-high heat. Preparation. Add the grated mozzarella and Parmesan cheese along with crushed black pepper. Fill oven-safe mugs with this prepared pasta. Add salt as needed. 1. Lastly, add the cooked pasta and mix it all together. Give it all a good mix.