In a small mixing bowl, combine the softened unsalted butter, minced garlic, chopped fresh parsley, dried oregano, salt, and black pepper. Mix well with a fork until all ingredients are evenly incorporated.

Preheat your oven to 375°F (190°C). Line a large baking sheet with parchment paper.

Slice the loaf of bread lengthwise through the middle, creating two halves. If your bread is very wide, you can also cut it into individual slices about 1 inch thick, but slicing lengthwise typically works best for cheesy garlic bread.

Generously spread the garlic butter mixture evenly over the cut sides of both bread halves (or individual slices). Ensure you go all the way to the edges.

Place the buttered bread halves, cut-side up, on the prepared baking sheet.

Bake in the preheated oven for 5-7 minutes, or until the edges of the bread are lightly golden and slightly crisp. This helps to toast the bread before adding cheese.

Remove the baking sheet from the oven. Evenly sprinkle the shredded mozzarella cheese over both bread halves, followed by the shredded Parmesan cheese. Ensure good coverage.

Return the baking sheet to the oven and bake for another 5-7 minutes, or until the cheese is completely melted, bubbly, and lightly golden brown in spots. For extra browning, you can broil for the last 1-2 minutes, watching carefully to prevent burning.

Carefully remove the garlic bread from the oven. Let it cool for 1-2 minutes before slicing each half into desired serving pieces (e.g., 4 triangles per half) with a sharp knife. Serve immediately and enjoy your delicious Cheesy Garlic Bread!