PREHEAT oven to 350°F. Add water to cranberries; stir. Let stand 10 min. to plump cranberries. Meanwhile, mix flour, sugar and baking powder in large bowl. Cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs. Add walnuts and drained cranberries; mix well. Add yogurt and cream; stir just until dry ingredients are moistened.

DIVIDE dough into 3 pieces. Pat each piece into 6-inch round on floured surface; cut each into 8 wedges. Place wedges, 2 inches apart, on ungreased baking sheets; brush with egg.

BAKE 15 to 18 min. or until lightly browned. Serve warm.