Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper.
In a large mixing bowl, whisk together the flour, baking powder, salt, garlic powder, oregano, and basil until well combined.
Stir in the shredded cheddar cheese and grated Parmesan cheese until evenly distributed.
In a separate bowl, mix the milk, olive oil, and beaten eggs until well combined.
Pour the wet ingredients into the dry ingredients and stir gently until just combined. Be careful not to overmix; a few lumps are okay.
If using, fold in the chopped parsley for added flavor and color.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake in the preheated oven for 45-50 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 about 10 minutes before transferring it to a wire rack to cool completely.