Preheat your oven to 375°F (190°C) and grease a 9-inch (23 cm) round baking pan.
In a large bowl, whisk together the flour, baking powder, and salt.
Add the cold butter pieces to the flour mixture and use a pastry cutter or your fingers to blend until the mixture resembles coarse crumbs.
Stir in the grated Pecorino Romano and Parmesan cheeses.
In a separate bowl, whisk together the eggs, milk, and olive oil.
Pour the wet ingredients into the dry ingredients and mix until just combined.
Be careful not to overmix.
Gently fold in the chopped fresh rosemary.
Pour the batter into the prepared baking pan and smooth the top with a spatula.
Bake in the preheated oven for 25-30 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
Let the Crescia cool in the pan for a few minutes before transferring it to a wire rack to cool completely.
Enjoy your meal!