01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large skillet over medium heat, cook ground beef until fully browned, breaking it apart as it cooks. Drain excess fat if needed.
03 - Add chopped onion, green bell pepper, and minced garlic to the skillet. Cook for 3 to 4 minutes until vegetables become tender.
04 - Stir in tomato sauce, tomato paste, ketchup, Worcestershire sauce, smoked paprika, brown sugar, salt, black pepper, and dried oregano. Simmer for 8 to 10 minutes until thickened, then remove from heat.
05 - Slice baguette in half lengthwise. In a mixing bowl, combine softened butter, minced garlic, chopped parsley, and 1/4 teaspoon salt until blended.
06 - Spread garlic butter evenly on both bread halves. Place them cut side up on the prepared baking sheet.
07 - Bake for 5 to 6 minutes until lightly golden. Remove from oven.
08 - Spoon the sloppy joe filling generously onto one half of each loaf. Sprinkle shredded mozzarella and grated Parmesan evenly over the filling.
09 - Return assembled bread to the oven and bake for 5 to 6 minutes, until the cheese melts and becomes bubbly.
10 - Place the top bread halves over the filled sides, press gently, and slice into portions. Serve immediately while hot.