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 thyme until well combined.
Stir in the shredded cheddar and grated Parmesan cheese, ensuring the cheese is evenly distributed throughout the dry ingredients.
In a separate bowl, combine the milk, vegetable oil, and eggs. Whisk until smooth.
Pour the wet ingredients into the dry ingredients and mix gently until just combined. Be careful not to overmix; a few lumps are okay.
If using, fold in the fresh parsley for added flavor.
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.