Combine all the ingredients in a bowl and mix using a spatula. (Using an egg will make the mixture much less crumbly, but it will also make them more bread-like. We prefer them without an egg, but feel free to add one if you're having trouble forming the graham crackers without them breaking apart.)
Pour the mixture out onto parchment paper and form a mound with your hands. Place another piece of parchment paper on top and using a rolling pin (or anything rollable) roll out the mixture into a thin layer.
Using a sharp knife or pizza cutter score the flattened out mixture into as many big or little crackers as you want. Finally, use a fork to score the crackers giving it it's classic graham cracker look!
Bake graham crackers at 300 degrees for 20 minutes. Allow to cool before breaking apart and enjoying!
TIP: If your mixture seems to crumbly, add more butter.
NOTE: The amount of crackers this recipe yields will vary on how many crackers you decide to make. We made 20, which is reflected in the nutrition.