In a medium mixing bowl, add 2 Tbsp sugar, ½ tsp baking soda, ¼ tsp salt, ¼ tsp cinnamon, ¼ cup maple syrup, 1 Tbsp molasses, and 2½ Tbsp melted coconut oil. Mix until smooth.
Add 1¼ cup oat flour, ¼ cup cornstarch, and 1½ Tbsp ground flax seeds. Mix until fully incorporated. The dough should be moist but not sticky. If you use un-floured hands to form it into a ball, it should not stick to your hands at all. If too sticky, you can add a bit extra oat flour.
Form dough into a ball. Place it between two sheets of parchment paper and roll to about ¼-⅛" thick depending on your preference. You can refrigerate the dough and chill for 15 minutes to help with the process. I find the parchment paper slides around on a counter, so it helps to weigh down two of the corners or get someone to help and hold the parchment paper.
Use a pizza cutter, bench scraper, or knife to cut the dough into 2"x3" rectangles. Transfer to a baking sheet lined with parchment paper. Recipe makes approximately 18 crackers depending on preferred thickness.
Roll up any scraps and reroll dough until finished. Prick each graham cracker with a fork in two rolls.
Bake 10-14 minutes at 350°F in the oven. I recommend setting your timer for a minute or two less, and watching the last few minutes to avoid burning.
Remove to a wire rack, or parchment paper or silicone on the counter to immediately stop the cooking.
(Optional) Trim two of the edges on each cracker immediately upon removing from the oven. This step is incredibly tedious, and I recommend skipping it. It will give you a small pile of graham cracker crumbs great for sprinkling, and it gives the graham crackers a more traditional look.