Our Favorite Macaroni and Cheese

Name: Our Favorite Macaroni and Cheese
Ingredients: 2 tablespoons unsalted butter, plus more for baking dish; 2 tablespoons extra-virgin olive oil; 2 cups panko (Japanese breadcrumbs); 2 large garlic cloves, minced; 2 ounces finely grated Parmesan (about 1/2 cup); 1/2 teaspoon kosher salt; 2 teaspoons kosher salt, plus more; 1 pound dried elbow macaroni; 1/2 cup (1 stick) unsalted butter; 6 tablespoons all-purpose flour; 4 cups whole milk; 3/4 cup heavy cream; 1/2 teaspoon ground white pepper; 1 1/2 tablespoons mustard powder; 16 ounces coarsely grated extra-sharp cheddar (about 6 cups); 2 ounces grated Parmesan (about 1/2 cup); 9- by 13-inch baking dish