Mix together the chia seeds and water in a small bowl. Let it sit for 15 minutes to form a chia egg.
In the meantime, heat up a small stovetop pan over low medium heat. Add the 1 tsp avocado oil. When hot, add in the 2 minced garlic cloves.
Stir the garlic around with a rubber spatula until lightly browned, about 2 minutes.
Remove the garlic from the pan and add in the other tsp of oil. Add the chopped onions and stir for about a minute or two, until lightly browned.
Remove the onions from the heat.
Add the garlic mixture and oil from the pan into a blender, food processor, or a large bowl if using a hand blender (which is the easiest way to do it). Add in the chia egg once it's ready, along with the rest of the ingredients.
Blend until a wet dough forms, making sure there are still chunks of beans left for texture.
Mix in the onions by hand.
Form the burger mixture into 5-6 balls, flattening them to medium thickness to form a patty.
Pour 1 tbsp avocado oil per patty in a large stovetop pan, making sure to coat the bottom evenly.
Add the patties into a large skillet, spacing evenly apart. If the pan is not big enough, separate them into batches.
Cook burger patties on low heat on one side for about 2 minutes, until they're easily able to be flipped with a wide spatula. Flip and repeat to cook the other side of the patty, adding more oil as needed to the pan.
Once each patty is done, remove from the pan and place into a flat plate with a wide spatula. Repeat until all the patties are cooked.
Use these patties in your favorite burger or sandwich. Enjoy!