1 1/2Cshredded sharp white cheddar cheese(divided)
1 1/2Cfresh white bread crumbs(pulse white bread slices in food processor until become medium to small crumbs)
2Tbspmelted butter
1-2tspwhite truffle oil
Instructions
Preheat oven to 375 degrees. Grease a 13x9 or 3-quart baking dish with butter.
Cook pasta in salted boiling water according to package directions, leaving the pasta slightly al dente (slightly firm). Drain well and set aside, saving 1/2 C pasta water.
Meanwhile melt butter in a large saucepan over medium heat. Add the flour and whisk in, for about 2 minutes until it starts to turn a pale tan color. Add the milk, 2 cups at a time and whisk in until smooth, cooking over medium low heat until mixture thickens and coats the back of a spoon, about 2-4 minutes. Stir in nutmeg, salt and pepper. Remove from heat and stir in the Gruyere cheese and 1 cup of the white cheddar cheese. Stir until cheese is melted. Stir in 1 tsp of truffle oil, and taste. Add more truffle oil bit by bit and re-taste, until you achieve the desired truffle flavor.
Mix together the cheese sauce and pasta, adding a bit of pasta water if it seems too thick (may not be necessary). Pour into baking dish. Top with remaining 1/2 cup of shredded white cheddar.
Mix together melted butter and fresh bread crumbs. Sprinkle bread crumbs on top of pasta. Bake for 30-35 minutes until the top is browning and sides are bubbling. Let rest 10 minutes before serving.