INGREDIENTS
1/2 cup
vegetable shortening
1/4 cup
butter
1/4 cup
sour cream
1/2 cup
granulated sugar
1/2 cup
brown sugar
1/2 tsp
salt
1 tsp
baking powder
1 tsp
vanilla extract
1
egg
2
+ 1/2 cup unbleached all-purpose flour
1/2 cup
cornstarch
about 3/4 cup strawberry or seedless raspberry jam
confectioners' sugar for sprinkling over top