Preheat Oven:
Preheat oven to 375°F (190°C). Grease a 9×5-inch loaf pan.

Mix Dry Ingredients:
In a large bowl, whisk together flour, sugar, baking powder, salt, mozzarella, and Parmesan cheese.

Combine Wet Ingredients:
In another bowl, whisk milk, melted butter, and egg until well combined.

Make Dough:
Pour wet ingredients into dry ingredients and stir until just combined.

Bake:
Pour batter into the prepared loaf pan and spread evenly. Bake for 35–40 minutes, or until golden brown and a toothpick inserted in the center comes out clean.

Prepare Garlic Butter Topping:
While bread is baking, mix melted butter with minced garlic and chopped parsley.

Serve:
Brush the garlic butter over the hot bread as soon as it comes out of the oven. Slice and serve warm.