In medium bowl, stir together whole wheat flour, baking powder, baking soda and salt. Set aside
In large bowl, cream together butter, and brown sugar. Beat in egg and vanilla. Stir in dry ingredients, mixing until well combined.
Stir in All-Bran Flakes cereals, dried cranberries and dar chocolate chips.
Drop dough by rounded 1 tbsp measure about 1 inch apart onto lightly greased (or parchment lined) baking sheets.
Bake at 350F (180C) for 8-9 minutes, until golden brown. Let cook for 2 minutes, then remove to racks and cool completely. Store in airtight container.