Softening the cashews first helps them blend. If you have a high-powered blender you may be able to skip this step, but if not, this step is important to get a smooth cheese. You can either boil or soak the cashews. To boil the cashews (the fast method): add the cashews to a small pot, cover with water, and boil for about 10 minutes until the cashews are very tender. To soak the cashews: add the cashews to a bowl, and cover with water. Let soak for 4 hours or overnight until tender. Drain and rinse cashews before using.

Add the cashews along with ⅔ cup of water, tapioca starch, nutritional yeast, vinegar, salt and garlic powder to a blender. Blend until completely smooth. It will be very watery.

Pour into a small saucepan and put over medium-high heat. Continually stir. The cheese will start forming clumps, keep stirring and it will continue clumping until the mixture turns from watery to a thicker melty cheese sauce. This takes 2 - 3 minutes.

Line a 4 inch spring form pan with parchment paper, or use a similar sized container lined with parchment paper, or use a 4 inch silicon mold. Pour the cheese into the prepared mold, and freeze overnight. This can be kept frozen until ready to use.

Preheat your 400F (200C). Line an 8" x 8" baking pan with parchment paper (or use a similar sized baking dish).

On a lightly floured surface roll out one of the puff pastry to ⅛" thickness, making a square that's about 10" x 10". Spread the cranberry sauce in the middle of the puff pastry making a circle about the same size as your vegan brie. Sprinkle the walnuts on top of the cranberry sauce. Then place the frozen un-wrapped brie on top of that. (I find placing the cranberry sauce on the bottom makes it easier to pinch the puff pastry closed without sauce escaping everywhere).

Gather the edges of the puff pastry and wrap around the brie. Pinch the pastry closed. Remove any excess pastry if needed. Optionally, you can use any leftover pastry to make leaf shapes or any other decorations you like. Once wrapped, brush the puff pastry with aquafaba or plant-based milk, this will help it get golden brown in the oven.

Carefully transfer the wrapped brie to the prepared baking pan and bake for 45 minutes or until the pastry is golden brown. Serve hot.