Add all ingredients to a large mixing bowl or food processor and mix until well combined. The cookie dough should pliable but a little dryer than typical cookie dough. You should be able to pinch it between two fingers without breaking.
If your cookie dough is a little dry (this will depend on your ingredients), add a little dairy-free milk and mix again. Divide the dough into 2 parts and set aside.
To make the ice cream:
Add all of the ingredients to a high powered blender and blend until as smooth as possible. Set aside.
To assemble the vegan ice cream sandwiches
Line an 8 inch (20 cm) square baking tin or one of a similar size with parchment paper with some paper coming up the sides of your tin.
Firmly press half of the cookie dough into your baking tin to form a flat base. Pull on the sides of the parchment paper to remove the slab of cookie dough (it will bend which is fine) and set aside.
Press the second half of the cookie dough into the lined baking tin. Pour all of the cashew ice cream mixture on top.
Freeze the baking tin for 1-2 hours or until the surface is just dry to the touch.
Carefully invert the remaining slab of cookie dough on top of the ice cream.
Set aside in the freezer for another 1-2 hours or until firm. It is ready when you can press the centre of the baking pan and there's no resistance (it means your ice cream has set).
Use a sharp knife to cut into slices (note 2). Enjoy immediately or store leftovers in an airtight container in the freezer for up to 2 weeks.
Notes
To make your own gingerbread spice blend, use 1 tablespoon ground cinnamon, 1 tablespoon ground ginger and ½ tablespoon ground nutmeg.
The ice cream sandwiches don't freeze into a solid brick so it should be easy to cut them into bars. However, if you have any troubles, run your knife under hot water or fill a tall jug with hot water and dip your knife and cut the sandwiches.
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