(Courtesy of Cook's Illustrated)
Ingredients:
TOPPING:
3-4 slices white sandwich bread with crusts, torn into quarters
1/4 c. (1/2 oz.) grated Parmesan cheese
1/4 tsp. salt
1/8 tsp. ground black pepper
PASTA AND CHEESE:
4 oz. Italian Fontina cheese, shredded (about 1 c.)
3 oz. Gorgonzola cheese, crumbled (about 3/4 c.)
1/2 c. (1 oz.) grated Pecorino Romano cheese
1/4 c. (1/2 oz.) grated Parmesan cheese
1 lb. penne
1 Tbsp. plus 1/4 tsp. salt
2 tsp. unsalted butter
2 tsp. all-purpose flour
1 1/2 c. heavy cream
1/4 tsp. ground black pepper
Directions:
For the topping: pulse bread in food processor until mixture resembles coarse crumbs, about 10 pulses (1 second each)- you should end up with about 1 1/2 c. Transfer to a small bowl; stir in Parmesan, salt and pepper. Set mixture aside.
For the pasta: adjust oven rack to middle position and heat oven to 500 degrees.
Bring 4 quarts of water to rolling boil in stockpot. Combine cheese in large bowl; set aside Add pasta and 1 Tbsp. salt to boiling water; stir to separate pasta. While pasta is cooking, melt butter in a small saucepan over medium-low heat; whisk flour into butter until no lumps remain, about 30 seconds. Gradually whisk in cream, increase heat to medium, and bring to a boil, stirring occasionally; reduce heat to medium-low and simmer 1 minute to ensure that flour cooks,. Stir in remaining 1/4 tsp. salt and pepper; cover cream mxiture to keep hot and set aside.
When pasta is al dente, drain about 5 seconds, leaving the pasta slightly wet. Add pasta to the bowl with the cheeses; immediately pour cream mixture over, then cover bowl with foil or a large plate and let stand for 3 minutes. Uncover bowl and stir with a rubber spatula, scraping bottom of the bowl, until cheeses are melted and mixture is thoroughly combined.
Transfer pasta to a 9x13 baking dish, then sprinkle evenly with reserved bread crumbs, pressing down lightly. Bake until topping is golden brown, about 7 minutes. Serve immediately.