Creating Martha Stewart’s Macaroni & Cheese is straightforward if you follow these simple steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C).
2. Cook Pasta: In a large pot of salted boiling water, cook the elbow macaroni until al dente, according to package instructions. Drain and set aside.
3. Make the Roux: In a separate large saucepan, melt the butter over medium heat. Once melted, add the flour and whisk continuously for about 2 minutes until it forms a paste.
4. Add Milk: Gradually whisk in the milk, ensuring no lumps remain. Continue to cook, stirring frequently, until the mixture thickens and bubbles, about 5-7 minutes.
5. Season: Stir in the salt, black pepper, and cayenne pepper (if using) for an extra kick.
6. Add Cheese: Remove the saucepan from heat and mix in the shredded cheddar and Gruyère cheeses, stirring until melted and smooth.
7. Combine with Pasta: Fold the cooked macaroni into the cheese sauce, ensuring all pasta is well coated.
8. Transfer to Baking Dish: Pour the macaroni and cheese mixture into a greased 3-quart baking dish.
9. Prepare Topping: In a small bowl, combine the breadcrumbs and grated Parmesan cheese. Sprinkle this mixture evenly over the macaroni and cheese.
10. Bake: Place the baking dish in the oven and bake for 25-30 minutes, or until the top is golden brown and the cheese is bubbling.
11. Cool Slightly: Remove from the oven and let cool for a few minutes before serving.

With these steps, you’ll have a delicious dish of Martha Stewart’s Macaroni & Cheese ready to be enjoyed!