To create this comforting classic, we combine two kinds of cheeses: Sharp cheddar adds a tangy taste, while smoked Gouda lends a delightfully smoky flavor and creamy texture.
Preheat an oven to 375F. Butter a large rectangular baking dish.
In a saucepan over medium heat, melt the 4 Tbs. butter. Add the flour and cook, stirring frequently, about 3 minutes. Whisk in the milk and cook, stirring frequently, until thickened, about 5 minutes. Whisk in the tomato paste. Add 1 1/2 cups of each cheese and stir until melted. Season with salt, black pepper and cayenne.
Tear the bread into crumbs. In a small bowl, stir together the bread crumbs and the 2 Tbs. melted butter and season with salt.
In a large bowl, combine the pasta and the cheese sauce, then pour into the prepared baking dish. Top with the remaining cheeses and the buttered bread crumbs. Bake until the cheeses are golden and bubbly, about 40 minutes. If the top becomes too dark, cover with aluminum foil. Let stand for 10 minutes before serving. Serves 8 to 10.
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