Preheat the oven to 375 degrees F. Line two cookie sheets with parchment paper.
Place the gluten free flour blend, oat flour, sugar, and baking powder in a mixing bowl. Whisk together to combine.
Add the melted vegan buttery spread, unsweetened applesauce, and corn syrup, and stir to combine.
Place teaspoonfuls of the dough onto the parchment paper lined cookie sheets. Leave about two inches in between the cookies, because they will spread during baking.
Bake at 375 degrees F for about 9 minutes, until the edges are golden brown.
Allow the cookies to cool for at least 15 minutes.
Put the dairy free chocolate chips in a microwave safe bowl and microwave them for one minute. Stir, then microwave in 15 second intervals, stirring in between, until they are smooth and melted.
Spread a little chocolate on the underside of half of the cookies. Top with the other half of the cookies to make sandwiches.
Place the completed cookies in the refrigerator for about 15 minutes so that the chocolate firms up. Enjoy!
Notes
If you want a thicker layer of chocolate in the middle of these cookies, you will need to melt a larger quantity of chocolate. You can store these at room temperature or in the refrigerator, it's up to you. They should stay fresh for about 5 days.