Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a mixing bowl, combine the flour, baking powder, salt, and garlic powder. Mix well.
Add the melted butter and milk to the dry ingredients. Stir until just combined and a soft dough forms.
Fold in the shredded mozzarella and cheddar cheese until evenly distributed in the dough.
Transfer the dough to a floured surface and knead it gently for about 1 minute. Do not over-knead.
Shape the dough into a rectangle or desired shape, about 1 inch thick.
Place the dough on the prepared baking sheet. If desired, brush the top with melted butter for extra flavor and color.
Bake in the preheated oven for about 20 minutes or until the top is golden brown.
Remove from the oven and let it cool slightly before cutting into pieces.
Optionally, sprinkle with fresh parsley for garnish before serving.