Creamy Baked Mac and Cheese

Name: Creamy Baked Mac and Cheese
Prep time: 10 min
Cook time: 70 min
Total time: 80 min
Yield: 8
Ingredients: Kosher salt; 1 pound (450g) elbow macaroni; 5 tablespoons (75g) unsalted butter, divided; 4 teaspoons (20g) sodium citrate (see note); 1 1/2 pounds (680g) grated sharp cheddar cheese (see note); 1 teaspoon (5ml) hot sauce, such as Frank's RedHot; 1/2 teaspoon (2g) mustard powder; 1/4 teaspoon (1g) garlic powder; 1/2 pound (225g) grated Gruyère cheese (see note); 1 cup panko bread crumbs (2 ounces; 55g)