Add flour to browned butter and stir to form a roux. Cook for about two minutes.
2 tablespoons flour
Slowly whisk in milk to ensure mixture is smooth and free of lumps. Bring mixture to a light boil then stir in sea salt, white pepper, and roasted garlic paste.
2.5 cups milk, sea salt, white pepper
Add 2 ½ cups cheese to the pan, about ½ cup at a time, mixing well between each addition. Stir until all cheese is melted and sauce is uniform in texture and color.
3.5 cups sharp cheddar cheese
Add in cooked pasta and mix until it is evenly coated with sauce. Transfer into a 9 by 9-inch square baking dish. Sprinkle remaining cup of cheese over top.
1 pound elbow macaroni pasta
In a small bowl, melt remaining 3 tablespoon butter (I just pop in the microwave), bread crumbs, and parsley to form a crumb mixture. Sprinkle this mixture over top of mac and cheese in baking dish.
⅓ cup panko bread crumbs, 1 ½ tablespoons dried parsley
Place dish in the oven and bake for 25-30 minutes or until top is lightly browned and mac & cheese is bubbly.