Grate zucchini into a large bowl (I use a medium grater). Place shredded zucchini into a clean tea towel or paper towels and squeeze excess water out. You should then have about one cup of zucchini.
Place zucchini into a large bowl. Stir in onion, egg, flour, baking powder, salt, parmesan cheese, and any herbs until combined.
Over medium to medium high heat, melt 1 tablespoon of olive and and 1 tablespoon of butter in large skillet.
Drop batter by the tablespoonful into hot pan, flattening out to be 3-4 inches in diameter, 1/4-1/8 inch thick.
Cook for 1 minute or so until the bottoms are deep brown and then flip. Gently press. Cook for 30 more seconds, remove to a plate, and season with more salt.
Melt more oil and butter into the hot pan and repeat until no more batter remains.