Preheat oven to 350 degrees.
Mix together flaxseed + water to make flax egg and set aside.
Melt together chocolate and vegan buttery sticks.
Stir in flax egg, and remaining ingredients. Pour into greased 8×8 pan.
Bake at 350 for 20-25 minutes, until center no longer jiggles.
Remove from oven and top with marshmallows. Return to oven for 5 more minutes.
Meanwhile, combine syrup and peanut butter over stove top. Stir until smooth. Gently stir in protein powder and graham crackers.
Spread Graham cracker layer over marshmallow layer.
Cool completely before cutting into 16 bars.