01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - In a large skillet over medium heat, cook ground beef until thoroughly browned, breaking it up with a wooden spoon. Drain excess fat if necessary.
03 - Add chopped onion, bell pepper, and minced garlic to the skillet. Sauté 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 oregano. Simmer for 8 to 10 minutes until thickened. Remove from heat.
05 - Slice the baguette in half lengthwise. In a mixing bowl, combine softened butter, minced garlic, chopped parsley, and salt.
06 - Spread the garlic butter evenly over both bread halves and place them cut side up on the prepared baking sheet.
07 - Bake for 5 to 6 minutes until lightly golden. Remove from oven.
08 - Generously spoon sloppy joe filling onto one half of each bread piece. Top with shredded mozzarella and grated Parmesan cheese.
09 - Return to the oven for 5 to 6 minutes, until cheese is melted and bubbly.
10 - Sandwich the top and bottom bread halves together, press gently, and slice into portions. Serve hot.