In a large bowl, whisk together the gluten free flour, almond flour, tapioca starch, baking powder & salt. Set aside.
In a bowl of an electric mixer fitted with the paddle attachment or using a hand mixer with a new large bowl, beat together the vegan butter and sugar for 5 minutes.
Next, beat in the egg & vanilla extract. Scrape down the sides of the bowl and mix for 1 minute, just until incorporated.
With the mixer on low speed, slowly add the flour mixture until just combined. Beat on medium for 30-60 seconds until a dough forms.
Transfer the dough to a large piece of plastic wrap and shape into a square. Wrap in the plastic wrap and refrigerate for at least 1 hour.
Preheat the oven to 325°F and line two baking sheets with parchment paper.
How to roll the dough: Place a piece of plastic wrap onto your counter or around a cutting board and sprinkle gluten free flour onto it. Break off ¼ of the refrigerated dough and place onto the surface and press down the dough with your palm so it’s a bit flatter. Sprinkle with more gluten free flour. Place a second piece of plastic wrap on top of the dough and tuck under the cutting board. Use a rolling pin to roll the dough between the two pieces of plastic wrap until it is about ¼ “ thick. Remove the top piece of plastic wrap and use a cookie cutter to cut out 3” circles for your hamantaschen.
Re-roll the dough scraps as previously directed to make more cookie cutouts. Continue to roll each quarter of dough until all are cut into circles.
Once ready to fill and shape hamantaschen, spoon 1 teaspoon filling into each circle of dough.
Whisk together the egg wash ingredients in a bowl (egg & water).
Brush egg wash along the perimeter of one of the circles of dough. This will help the dough hold it’s shape. Pinch the edges of the circle of dough together to form three corners. Place back onto the baking sheet.
Repeat step 11 until all the hamantaschen are shaped.
Chill shaped hamantaschen in the freezer for 30 minutes or in the fridge for 1 hour.
Bake for 20-23 minutes or until lightly golden.