2. Stir corn syrup with brown sugar in medium saucepan set over medium heat. Cook, stirring constantly, until mixture comes to full boil. Remove from heat; stir in peanut butter and vanilla. Add rice and cornflake cereals; stir until well coated.
3. Drop by teaspoons onto ungreased baking sheets. Loosely shape into balls; gently press chocolate piece in center of each ball, forming gently into a thumbprint cookie shape. Store, in an airtight container, at room temperature.
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