Preheat your oven to 200°C (390°F) and line a baking sheet with parchment paper or a silicone mat.
Grate the zucchini and carrots using a box grater, then place them in a clean towel or cheesecloth to squeeze out as much excess moisture as possible—this helps keep the fritters crispy.
Finely chop or grate the small onion, then add it to the grated vegetables in a large mixing bowl.
Add the all-purpose flour, beaten eggs, olive oil, chopped parsley, and your favorite spices to the bowl. Mix everything together until well combined and the mixture holds together when pressed.
Scoop about 1/4 cup of the mixture and shape it into a round patty, then place it on the prepared baking sheet. Repeat with the remaining mixture, flattening each fritter slightly with the back of a spatula.
Lightly brush or spray the tops of the fritters with a little olive oil for extra crispness and color.
Bake the fritters in the preheated oven for 20–25 minutes, flipping them carefully halfway through, until they are golden brown and crispy on the edges.
Once baked, remove the fritters from the oven and let them rest on a wire rack for 5 minutes to maintain their crunch.
Serve the crispy vegetable fritters warm, with a squeeze of lemon or your favorite dip for extra flavor.