In a food processor, using a medium sized blade, shred veggies, starting with the onion, to prevent the potato from browning.
Transfer shredded veggies to a colander and squeeze the vegetables to remove excess liquid.
In a separate bowl, whisk eggs, flour or gluten free flour and seasoning together. Add herbs and potato and vegetables, stirring well to combine.
In a heavy skillet, heat about 2 tablespoons of olive oil over a medium heat. Squeeze excess liquid out of potato mixture, and fry, pressing gently to flatten cakes. Cook 2-3 minutes, depending on thickness, then flip and continue to cook until cakes are golden brown and cooked through.