Make the dough: In a small bowl, mix almond flour, tapioca flour, coconut flour, sugar, oil, milk, until a dough forms. Chill for 5–10 minutes to make it easier to roll.
Prepare the filling: Stir together coconut sugar, cinnamon, and melted oil until combined.
Roll out the pastry: Place dough between two sheets of parchment and roll into a small rectangle. Cut in half to make two even rectangles.
Assemble: Spoon the filling onto one rectangle, leaving a border around the edges. Brush edges lightly more oil, then place the second rectangle on top. Use a fork to seal the edges.
Bake: Transfer to a lined baking sheet and bake at 350°F (175°C) for 12-14 minutes, until lightly golden.
Glaze: While still warm, whisk together glaze ingredients and drizzle over the top. Let set before enjoying (if you can wait!).