01 -
Place zucchini, eggs, flour, Parmesan cheese, mozzarella cheese, onion, and salt in a medium bowl; stir until well combined.
02 -
Heat oil in a skillet over medium-high heat.
03 -
Scoop tablespoonfuls of zucchini mixture into hot oil and fry, working in batches, until golden brown, about 2 minutes per side.