Prepare the zucchini: Grate the zucchinis using a box grater or food processor. Place the grated zucchini in a clean kitchen towel or cheesecloth, and squeeze out any excess moisture.

1. Mix the ingredients: In a large bowl, combine the grated zucchini, salt, flour, breadcrumbs, Parmesan cheese, eggs, parsley, garlic powder, and pepper. Stir everything together until well combined.
2. Heat the oil: Heat the olive oil in a large skillet over medium heat until hot but not smoking.
3. Form and fry the fritters: Using a spoon, scoop about 2 tablespoons of the zucchini mixture, form into a small patty, and gently press it down to flatten. Fry the fritters for about 3-4 minutes per side until golden brown and crispy. Flip carefully with a spatula.
4. Drain and serve: Transfer cooked fritters to a paper towel-lined plate to drain excess oil. Serve immediately with sour cream or yogurt if desired.