Preheat oven to 325°F [160°C]).
Reserve the white of one egg for glazing; refrigerate.
Combine 2 cups (500 mL) of the flour with baking powder,
cinnamon and salt; set aside.
In a large bowl with mixer at medium speed, beat peanut butter,
butter, brown sugar, corn syrup, 2 eggs and remaining egg yolk
until smooth. Blend in flour mixture. Stir in remaining 2 cups
(500 mL) flour. Wrap dough in plastic wrap; refrigerate at least
3 hours or overnight.
Lightly beat reserved egg white with fork. On floured surface roll out one third of the dough to
1/8 inch (3 mm) thickness. Cut with floured star-shaped cookie cutter.
Place on ungreased baking sheets. Brush cookies with beaten egg white;
sprinkle with granulated sugar. Repeat with remaining dough.
Bake 12 to 15 minutes or until lightly browned.
Remove from baking sheets; cool completely on wire rack.
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