Grate the zucchini. Once grated, using a clean towel squeeze the vegetable to remove any extra water.
Transfer the grated and squeezed zucchini to a bowl, then add the egg, the olive oil, the salt and pepper to taste. Stir well, until all ingredients are combined.
Gradually sift in the oat flour and baking powder, mixing to incorporate with the batter. Depending on the size of the zucchini, you may need to adjust with more flour if it is too liquid.
Heat a 20 cm (7.8 inches) nonstick skillet, slightly greased or oiled. When hot, pour the zucchini pizza batter into the pan. Cook over low/ medium heat until the underside is golden, then carefully flip and cook on the other side.