Pour the quinoa into a bowl, cover with cold water and allow to soak overnight.
Preheat the oven to 325 degrees.
Drain quinoa, then transfer to a blender with the garlic, ½ cup water and salt.
Blend on high, adding more water if needed to achieve a loose pancake batter. A looser batter will result in a thinner, lighter cracker, while a thicker batter will be a bit tougher.
Spread olive oil out onto a sheet pan lined with parchment paper. Pour the batter over the olive oil and spread out into an even thickness. Sprinkle with desired seed mixture, or leave plain.
Bake for about 30 minutes, or until browned and crisped all over (may take longer).
Allow to cool to room temperature, then break into pieces. Store in an airtight container for up to 1 month.