Instructions:

Preheat oven to 375°.
Butter a 2-quart baking dish with ½ tablespoon butter. Cook pasta according to package directions and drain. In a medium bowl combine 2 tablespoons melted butter with breadcrumbs and sharp cheddar. In a medium saucepan over medium heat, melt 2 tablespoons butter. Add flour and whisk constantly for 3 minutes. Gradually add milk and bring to a boil. Reduce heat to a simmer and stir in nutmeg, red pepper, mustard, salt and pepper. Cook, stirring constantly, until sauce begins to thicken, about 7 minutes. Remove from heat and add classic cheddar shreds, stir until smooth. Stir in pasta. Pour into baking dish and top with breadcrumb mixture. Bake until cheese is bubbling and top is golden, about 25 minutes.