Add spinach, parsley and garlic cloves to a food processor and pulse until chopped. Add in all remaining ingredients apart from the gluten free flour and pulse until the mixture starts to come together. Don't blend too long, as you need to be able to have a mixture that can form into a dough.
Gradually add in gluten free flour, 2 tbsp at a time until the mixture is thick enough to form patties. Add a tbsp of flour more at a time if it's still to soft. Set aside in the fridge to chill for ten minutes.
Heat up a large skillet with 2 tbsp oil over a medium-high heat. Form falafel, I like to use a heaped tbsp measurement per falafel. Fry for 3-4 minutes each side, turning when golden.