Preheat oven to 350 degrees F. Line a 13×9 inch pan with foil and spray foil with cooking spray.Melt the butter in a microwave-safe mixing bowl. When melted, add the brown sugar to the hot butter and stir well. Stir in the granulated sugar, honey, vanilla and egg just until mixed. Beat in the baking powder and salt; stir in the flour. When well mixed, stir in the oats, cereal, nuts and butterscotch chips.
Bake for 22 to 25 minutes or until bars appear set.
Let cool completely in the pan, then lift from pan and cut into bars