Preheat oven to 400 degrees F (200 degrees C).
Place the baguette halves cut-side up on a baking sheet.
Sprinkle the mozzarella cheese evenly over the baguette halves.
Top with Parmesan cheese.
Drizzle with olive oil.
Bake for 10-15 minutes, or until the cheese is melted and bubbly.
Cut into bite-sized pieces.
Serve immediately, drizzled with additional olive oil, salt, and pepper if desired.