First, preheat the oven to 375°F and prepare* the oat flour if you don't have oat flour readily available.
Then prepare the flax egg; mix 1 tbsp flax meal(ground flax seeds) with 2½ tbsp water, stir well, and let sit for at least 5 minutes.
Stir all of the dry ingredients together, except the peanut butter cups.
Then combine the coconut oil and peanut butter in a different bowl til completely combined.
Then add this mixture and the rest of the wet ingredients to the dry ingredients and mix well.
Roll the dough into balls.
Optional: roll the balls in brown sugar.
Then bake for 10 to 12 minutes; you can unwrap the peanut butter cups while the cookies bake.
Top the cookies with the peanut butter cups as soon as they come out, then let cool. Once completely cool; enjoy!!
* Prepare the oat flour by grinding the oats with a milling blade(I use my nutribullet), or a food processor or blender will work as well.