Between 2 sheets of plastic wrap, pound chicken until flattened to 1/4-inch thickness. Place in reclosable plastic bag. In 1-cup glass measure, combine oil, wine, honey, tarragon, dry mustard, salt and pepper. Pour over chicken. Seal bag and turn to coat chicken. Refrigerate at least 4 hours or overnight. Remove from marinade. Place on grid over medium-hot coals. Grill about 10 minutes, turning once, until lightly browned on both sides and cooked through. Spread herbed cream cheese evenly over one side of each bread slice. Place 1 chicken breast on each of 4 slices of bread; top with sprouts. Place second bread slice cheese-side down on top of each sandwich. Brush outside of sandwiches with melted butter. Place on grid over medium-hot coals; grill 2 to 3 minutes on each side. Serve immediately. NOTES : Grilled chicken, grilled sourdough, and herbed cream cheese....its delicious with our Four Cheese Soup! Recipe by: Dierbergs Home Economists Posted to MC-Recipe Digest by Jill & Joe Proehl on Apr 05, 1998