Preheat oven to 350 degrees.
Combine flour, baking soda, and cinnamon in bowl, and mix well. Crush raisin bran into small pieces. Mix cereal into flour mixture and stir. In a mixing bowl, beat butter and sugar, until light and fluffy. Add eggs and beat. Add cereal mixture and stir until well combined. Drop tablespoons of batter onto ungreased cookie sheet. Put in the oven and bake for 12-14 minutes, until slightly browned. Remove from oven and cookie sheet and cool on racks immediately. Serve cooled.