Prepare the Pan: Line an 8x8-inch square baking pan with parchment paper, leaving an overhang on two opposite sides. This overhang will make it easier to lift the bars out of the pan.
Mix the Wet Ingredients: In a microwave-safe bowl, combine the peanut butter and honey. Microwave in 20-30 second intervals, stirring between each one, until the mixture is smooth and well combined. Stir in the vanilla extract.
Add the Dry Ingredients: In a large mixing bowl, combine the rice krispy cereal, mini chocolate morsels, ground flax seeds, and oats. Mix them together, ensuring an even distribution of all the ingredients.
Combine Wet and Dry: Pour the peanut butter and honey mixture over the dry ingredients. Stir everything together until the dry ingredients are thoroughly coated with the peanut butter and honey mixture. You might need to use a bit of elbow grease to ensure everything is well combined.
Press into the Pan: Transfer the mixture to the prepared baking pan. Use a piece of parchment paper or a spatula to press it down firmly and evenly.
Cool and Set: Let the cereal bars sit at room temperature for about an hour or pop them in the refrigerator for quicker results. Once they've cooled and set, use the parchment paper overhangs to lift them from the pan.
