Step 1: Prepare the Burger Patties: Gently combine ground beef, salt, pepper, and garlic powder in a large bowl. Form into 4 equally sized patties. Avoid overmixing to maintain a tender texture.
Step 2: Cook the Patties: Preheat a grill or skillet over medium-high heat. Cook patties for 4-5 minutes per side, or until cooked through and internal temperature reaches 160F (71C).
Step 3: Make the Cheese Sauce: In a large saucepan, melt butter over medium heat. Whisk in flour until smooth, creating a roux. Gradually whisk in milk until smooth. Bring to a simmer, stirring constantly, until the sauce thickens slightly.
Step 4: Add Cheese and Macaroni: Reduce heat to low. Add shredded cheddar cheese to the sauce, stirring until melted and smooth. Stir in cooked macaroni until well coated.
Step 5: Assemble the Burgers: Lightly toast hamburger buns. Place a cooked patty on the bottom bun. Top with a generous serving of mac and cheese. Cover with the top bun.
Step 6: Serve Immediately: Serve the mac and cheese burgers immediately while the mac and cheese is hot and creamy. Pair with your favorite burger sides.
For a richer flavor, use a blend of cheddar and Gruyere cheese in the mac and cheese. Crispy bacon or caramelized onions can be added as toppings for extra flavor and texture.