Preheat your oven to 400°F (205°C). Line a baking sheet with parchment paper.
In a large bowl, mix oat flour, rolled oats, baking powder, baking soda, salt, and cinnamon. Stir well so everything is evenly mixed.
Add the cold coconut oil or vegan butter. Use your fingers or a pastry cutter to break it into the flour until the mixture looks crumbly.
In a separate bowl, mix maple syrup, oat milk, vanilla, and apple cider vinegar.
Pour the wet mixture into the dry ingredients. Gently stir until a soft dough forms. Do not overmix.
If using nuts, fold them in now.
Place the dough on the parchment paper. Pat it into a round circle about 1 inch thick.
Cut the dough into 8 wedges. Leave space between them.
Place the tray in the fridge for 20 minutes. This helps the scones bake better.
Bake for 18–22 minutes, until the tops look set and the edges are lightly golden.
Let cool for 10 minutes before serving.