Preheat oven to 400°F.
Prepare Streusel Topping; reserve.
Cut margarine into flour, sugar, baking powder and salt with a pastry blender in a large bowl until mixture resembles fine crumbs.
Stir in almonds.
Stir in egg and just enough half-and-half so dough leaves side or bowl and forms a ball.
Turn dough onto a lightly floured surface; gently roll in flour to coat,
Knead lightly 10 times.
Pat or roll into a 9-inch circle on an ungreased cookie sheet.
Sprinkle with topping; press lightly into dough.
Cut into 8 wedges, but do not separate.
Bake about 15 minutes or until golden brown.
Immediately remove from cookie sheet; carefully separate wedges.