Combine first 6 ingredients in a medium bowl; cut in margarine with a pastry blender until mixture resembles coarse meal. Add almonds; toss well. Add yogurt to dry ingredients, stirring just until dry ingredients are moistened.
Sprinkle 1 tablespoon flour evenly over work surface. Turn dough out onto floured surface, and knead 3 or 4 times. Pat dough into an 8-inch round on a baking sheet coated with cooking spray. Cut round into 8 wedges, cutting to, but not through, bottom of dough. Brush wedges with egg white. Bake at 425° for 10 to 12 minutes or until golden.