1 1/2 cups coarsely grated Gruyère cheese
1 1/2 cups coarsely grated sharp cheddar cheese (about 6 ounces)
1 1/2 cups diced rindless Brie (cut from 1-pound wedge)
5 tablespoons butter, divided
1/4 cup all purpose flour
2 teaspoons chopped fresh thyme leaves
3/4 teaspoon (scant) nutmeg
4 cups whole milk
1 3/4 cups fresh breadcrumbs made from crustless French bread
1 pound penne pasta
8 teaspoons whipping cream (if making 1 day ahead)

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