Category: not set
Cuisine: not set
Kosher salt and freshly ground black pepper
4 tablespoons unsalted butter plus more for the baking dish
1 medium onion finely chopped
8 ounces cremini mushrooms sliced
1/4 cup all-purpose flour
2 cups whole milk
1 cup chicken broth
8 ounces medium pasta shells (about 3 cups)
One 6-ounce jar Italian tuna in olive oil drained and flaked
2 tablespoons chopped fresh flat-leaf parsley
2 cups grated sharp white Cheddar
1 1/2 cups crumbled flavored potato chips, such as salt-and-
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