Preheat the oven to 350 degrees F.
In a medium bowl, add 2 cups of dry oats.
Blend the remaining half cup in a spice grinder or blender until it's oat flour. This should take a few seconds in a high speed blender.
Add the oat flour into the rolled oats, then add baking soda and salt. Stir to combine. Set aside.
Melt the vegan butter in a small saucepan on the stove over medium heat, then add in the honey, sugar and vanilla until it is all a liquid. Turn off the heat and stir in the vanilla.
Pour the wet mixture into the dry mixture and stir to combine.
When everything is fully mixed, lightly grease the bottom of the baking tray or line it with parchment paper. Then pat the mixture down evenly into an 8x8 inch baking tray.
Bake at 350 degrees F for 20 minutes, then take them out of the oven and let them cool. They'll harden and become crispy after they're completely cooled. I would eat them right after that, but you could also store them in a container (I probably wouldn't put them in an airtight container though, because it usually makes my baked goods softer than they should be over time).