Preheat oven to 400 degrees F. Line two baking sheets with aluminum foil and spray with cooking spray.

Brush cut sides of bread with olive oil. Place on prepared pan and bake for about 5 minutes, or until lightly toasted.

Spread marinara sauce on top of cut sides of bread. Top evenly with mozzarella cheese. Layer bacon, shrimp, and pineapple over mozzarella. Sprinkle with Parmesan cheese.

Bake for about 10 more minutes, or until cheese melts. Cut into slices and serve hot.