Heat oven to 400°F. In 12-inch skillet, melt butter over medium heat. Cook mushrooms in butter 5 to 6 minutes, stirring occasionally, until browned and tender. Stir in peas and onions. Sprinkle flour over mushroom mixture in pan; cook over medium heat 1 minute, stirring frequently.
Stir in broth, pimientos, sherry, salt and red pepper; cook 5 minutes or until thickened. Stir in chicken and whipping cream until blended. Spoon chicken mixture into ungreased 9 1/2-inch glass deep-dish pie plate.
Unroll dough on work surface. With sharp knife, cut out shapes for eyes, nose and mouth; discard cutouts. Place dough over hot filling; trim edges and press with fork to seal. Bake 25 to 30 minutes or until crust is golden brown and filling is bubbly.