In large bowl stir together oats, chocolate chips and flax seeds and set aside.
In small saucepan heat peanut butter and honey over medium heat, stirring often, until melted and smooth. Remove from heat and pour over oat mixture and stir to combine.
Transfer to a parchment lined 7×5 baking dish. Press mixture to form an even layer. Place in fridge to set for about 2 hours. Then when set break into pieces and store in air-tight container.