In a small bowl, cream butter and cream cheese until smooth. Gradually beat flour into creamed mixture. Divide dough in half. Shape each into a disk. Cover and refrigerate 1 hour or until firm enough to handle., Preheat oven to 350°. Shape dough into 1-in. balls; place in greased mini-muffin cups. Using floured fingers, press evenly onto bottoms and up sides of cups., Cook broccoli according to package directions; drain. In a large bowl, combine egg, condensed soup, milk and mayonnaise; stir in cheese and cooked broccoli. Spoon about 1 tablespoon filling into each cup. For topping, mix bread crumbs and melted butter; sprinkle over filling., Bake until edges are golden brown, 18-22 minutes. Cool in pans 2 minutes before removing to wire racks. Serve warm. To Make Ahead: Dough can be made 2 days in advance. Freeze option: Freeze cooled pastries on waxed paper-lined baking sheets until firm. Transfer to resealable freezer containers. To use, reheat pastries on ungreased baking sheets in a preheated 350° oven 14-16 minutes or until lightly browned and heated through.