Preheat oven to 350 degrees F. In a small bowl combine flour, baking powder, cinnamon, and salt; set aside.
In large mixing bowl beat butter with an electric mixer on medium to high speed for 30 seconds. Beat in brown sugar and granulated sugar until well combined, scraping sides of bowl occasionally. Beat in eggs and vanilla until combined. Gradually beat in flour mixture until well combined. Stir in cereal (dough will be thick and chunky).
Drop dough by well-rounded teaspoons onto ungreased cookie sheet. Bake 8 to 10 minutes or until golden. Transfer cookies to wire rack to cool. Makes about 4 dozen.