To a blender add milk, eggs, maple syrup, and vanilla extract.
Then add oat flour, all purpose flour, salt and butter.
Cover and blend on low speed until well combined, about 10 seconds.
Heat a 10-inch non-stick skillet over medium heat.
Once heated spray inside bottom of pan evenly with cooking spray. Add a scant 1/3 cup crepe batter from blender to the pan, immediately tilt and swirl to coat bottom in a thin even layer of the batter.
Let cook until golden brown on bottom then use an offset spatula to one side of the crepe, turn to opposite side and cook until just golden brown on bottom. If needed reduce burner temperature slightly.
Transfer crepe to a wire rack.
Repeat process until all the batter has been used up. You can keep crepes warm in a tea towel or just fold into fourths and stack. Note that as batter rests it will thicken, you can thin with a few more tablespoons of milk as needed.
Notes
*A nondairy milk could be used as well you'll just want to add a few tablespoons less since it's thinner.