Cook spinach, drain very well. Make sure the mixture is not too wet or not too dry. Adjust accordingly.
Chop garlic and onions. Add in all ingredients and mix by hand.
Using a skillet, cover skillet bottom with vegetable oil making sure you heat vegetable oil until a drop of water bounces. Form patties from spinach mixture and fry until lightly browned on both sides.
If you prefer a more garlicky taste, add garlic powder.