Preparation of Shrimp: Preheat oven to 375°F (190°C). In a skillet, heat olive oil over medium heat. Add the shrimp and cook until pink and cooked through, about 3-4 minutes. Season with salt and pepper. Set aside.

Garlic Butter Preparation: In a small saucepan, melt butter over medium heat. Add minced garlic and red pepper flakes (if using). Cook until fragrant, about 1 minute. Remove from heat.

Bread Preparation: Slice the baguette in half lengthwise. Lay both halves cut side up on a baking sheet.

Assembling: Brush the garlic butter generously over the cut sides of the bread. Sprinkle mozzarella evenly over each half. Distribute cooked shrimp over the cheese layer. Top with grated Parmesan cheese.

Baking: Bake in the preheated oven for about 10-15 minutes, or until the cheese is melted and bubbly, and bread edges are golden.

Finishing Touches: Remove from the oven and garnish with chopped parsley. Slice and serve warm with lemon wedges on the side.