At high heat, place oil in a deep fryer or a deep pan, enough that the rissois will be fully submerged in oil.
For the wet batter, whisk flour, non-dairy milk, water, salt, and garlic and onion powder in a bowl until fully combined. You can also substitute the wet batter with a couple of beaten eggs.
Place bread crumbs in a separate bowl.
Fully submerge the rissois in the wet batter. Make sure it is completely and evenly battered.
Take the rissois out of the wet batter and transfer them into the bread crumbs. Make sure there is no excess batter before transferring.
Once the rissois are evenly coated in bread crumbs, transfer into the hot oil.
Fry the rissois until they are a deep golden-brown colour, approximately 1-2 minutes, flipping them halfway.
Remove rissois and place onto a paper-lined tray to absorb the excess oil.
Best served warm.