Preheat your oven to 350°F (175°C). Grease your loaf pan or line it with parchment paper.
In a mixing bowl, combine the all-purpose flour, baking powder, and salt. Mix well.
Stir in the shredded mozzarella cheese, chopped olives, and grated Parmesan cheese, ensuring they are evenly distributed throughout the dry ingredients.
In a separate bowl, beat the eggs. Add the milk and olive oil, mixing until well combined.
Pour the wet ingredients into the dry mixture. Stir gently until just combined, being careful not to overmix.
If using, fold in the dried oregano.
Transfer the batter into the prepared loaf pan, smoothing the top with a spatula.
Bake in the preheated oven for about 25 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for a few minutes before transferring it to a wire rack to cool completely.