Unroll pie crusts on lightly floured surface. Use rolling pin to roll each to 12-inch circle. Cut each crust into 8 (4-inch) circles with biscuit cutter or cut around a 4-inch glass top, rerolling dough as needed. Place on parchment-covered baking sheets. Spoon 2 tablespoons chicken mixture onto center of each circle; brush edge with egg. Fold dough circles in half. Press tops lightly to remove excess air; seal edges with fork. Brush tops with remaining egg. Sprinkle with chili powder.
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