Lightly spray an 8” baking sheet with non-stick spray or line it with parchment paper. In a medium bowl, mix cereal with peanuts, cranberries and blueberries and set aside.
Next stir together honey, peanut butter, brown sugar and peanut flour (if using) in a microwave safe bowl.
Heat in 30 second increments, stirring in between, until the mixture is combined and pourable. All at once, add honey & peanut butter mixture to dry ingredients, stirring quickly to combine.
Pour the mixture into the prepared pan, pressing into the pan with a silicone or lightly oiled spatula, and let cool completely.
Once bars are completely cool and set up, turn out on a cutting board and cut into 12 equal sized bars.