Foryoueats: Creamy Baked Mac and Cheese

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)