In a large mixing bowl, whisk together the all-purpose flour, instant yeast, salt, and garlic powder. Set aside.

Pour in the warm water and olive oil; stir until a shaggy dough forms.

Gently fold in the shredded mozzarella and cheddar cheese.

Transfer the dough to an oiled bowl, cover it, and let rise for about 2 hours.

Preheat your oven to 450°F (230°C) with your Dutch oven inside.

Once risen, shape the dough into a round loaf and let rest for 20 minutes.

Carefully transfer the dough to the hot Dutch oven lined with parchment paper.

Cover the Dutch oven and bake for 30 minutes, then remove the lid and bake for another 12-15 minutes.

Mix melted butter with Parmesan cheese and brush it on the warm loaf. Let cool for at least 20 minutes before slicing.