Heat butter in a saucepan over medium heat. Saute onion util tender and golden. Blend in flour, salt and pepper. Add broth and whick well. Cook until thick and bubbly; add remaining ingredients except pastry. Divide evenly amoung 6 individual casserole dishes; set aside. Cut puff pastry into 6 squares to fit the tops of dishes; cut a steam vent in the center of each with a mini cookie cutter. Place pastry tops on casserole dishes; set dishes on a baking sheet. Bake at 400 degrees util pastry is golden, about 10-15 minutes.
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