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 browned, breaking up meat as it cooks. Drain excess fat if needed.
03 - Add chopped onion, bell pepper, and garlic to the skillet. Cook for 3 to 4 minutes until vegetables are softened.
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. Remove from heat.
05 - Slice baguette in half lengthwise. In a small bowl, mix softened butter with minced garlic, chopped parsley, and salt until combined.
06 - Spread the garlic butter evenly over both bread halves. Arrange the bread, cut side up, on the prepared baking sheet.
07 - Bake bread for 5 to 6 minutes until lightly golden. Remove from oven.
08 - Generously spoon the sloppy joe filling onto one half of each bread piece. Top with shredded mozzarella and grated Parmesan cheese.
09 - Return bread to the oven for 5 to 6 minutes, until cheese is melted and bubbly.
10 - Place the top halves of the bread over the filled halves. Press gently together, slice into portions, and serve hot.