Roquefort Onion Tart
["1 frozen (9-inch) pie crust, thawed", "2 small onions, finely chopped", "2 tsp. olive oil", "1 large egg, beaten with 5 tsp. heavy cream", "1/4 lb. Roquefort cheese, crumbled"]
["Preheat oven to 375\u00b0.", "Bake crust 8 to 10 minutes.", "Saute onions in oil until limp and golden.", "Transfer with slotted spoon to crust, distribute evenly.", "Sprinkle Roquefort over top.", "Spoon egg and cream mix over and bake until set, 15 to 20 minutes."]
["frozen", "onions", "olive oil", "egg", "Roquefort cheese"]