TREK Protein Flapjacks meet the iconic Biscoff - the ONLY official flapjack with Biscoff! TREK Biscoff Protein Flapjacks are filled with hearty oats and soya protein crispies, smothered with a rich generous layer of iconic Biscoff topping, and packed with 9g plant-based protein for natural energy. Each plant-based TREK Flapjack is 100% plant-based, vegan and a source of fibre.