Heat oven to 350°. Grease bottom and sides of jelly roll pan, 15
1/2x10 1/2x1 inch, with shortening. Mix granulated sugar, butter,
vanilla and eggs in medium bowl with spoon. Stir in flour and baking
powder until dough forms. Reserve 1/4 cup dough; cover and
refrigerate. Pat remaining dough evenly in pan, using floured hands.
To make flag design, mark a 6x5-inch outline in upper left corner
of pan, using toothpick, for "star" area. Spread blackberry jam over 6x5-
inch area. Starting 1/4 inch from top of "flag" (long side of pan), mark
stripes by pressing 1/2-inch-wide and 1/4-inch-deep groove into dough
with end of wooden spoon or finger. Make 7 more grooves, each about
3/4 inch apart. Place strawberry jam in resealable plastic food-storage
bag; cut off tip. Squeeze jam into grooves.
Pat reserved dough to 1/8-inch thickness on lightly floured
surface. Cut with small star-shaped cutter. Place stars on blackberry
Bake 18 to 22 minutes or until golden brown. Cool completely,
about 1 hour. Sprinkle with powdered sugar. For bars, cut into 8 rows
by 7 rows.