Make sure the butter is at room temperature. Prepare a baking tray lined with parchment paper and set aside.
Making the dough
In a mixing bowl, Sieve gluten-free flour, baking powder and salt using a handmixer or a whisk. Now, add in softened butter and mix well. Then, add in granulated cane sugar, brown sugar and vanilla extract and mix well.
Incorporate the butter into the flour until the flour is covered with butter.
Start adding milk into the mixture and use your hands to form a dough. I used 6 tbsp of milk to form the dough.
Make sure you're adding the milk gradually, take care not to make the dough sticky. Stop adding milk when the dough comes together as shown.
Cover the dough with plastic wrap and put in the refrigerator for at least 15-20 minutes. This step helps retain the shape of the cookies when baked. We are not looking at freezing the dough but just so that the butter firms up and holds the shape.
Shaping and Baking
Preheat the oven to 350 deg F. Take out the dough from the refrigerator, and prepare the surface for rolling by placing a plastic wrap or parchment paper.
Take a portion of the dough and place it in the middle of the plastic wrap, cover it, and flatten it using a rolling pin, applying pressure while also keeping the dough together.
Roll out the dough into about 1/8 inch thickness and using a pizza cutter or knife cut them into rectangular shapes. Place the graham crackers onto the lined baking tray. Repeat the process for the remainder of the dough.
Make small incisions/ holes on the surface of these crackers by using a knife/ fork or a skewer. Place the baking tray into the middle rack of the oven and bake for about 25 minutes or until the crackers are light brown.
Turn off the oven and let them cool on a wire rack for 20 minutes.
Serving and Storing
The graham crackers can be enjoyed by themselves for breakfast with your favorite beverage, they also taste great as sandwiches with chocolate cream or jam in between.