01 - Preheat oven to 400°F (204°C) and line a baking sheet with parchment paper.
02 - In a large skillet over medium heat, cook the ground beef, breaking it apart until fully browned. Drain off 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 are softened.
04 - Incorporate tomato sauce, tomato paste, ketchup, Worcestershire sauce, smoked paprika, brown sugar, salt, black pepper, and dried oregano into the skillet. Stir well and let the mixture simmer for 8 to 10 minutes, until thickened. Remove from heat.
05 - Slice the baguette in half lengthwise. In a bowl, mix together softened butter, minced garlic, chopped parsley, and salt until well combined.
06 - Evenly spread the prepared garlic butter over the cut side of each bread half. Arrange the bread halves, cut side up, on the prepared baking sheet.
07 - Bake the bread halves for 5 to 6 minutes until lightly golden. Remove from oven.
08 - Spoon the sloppy joe mixture generously over one half of each toasted bread piece. Sprinkle with shredded mozzarella and grated Parmesan.
09 - Return assembled bread to the oven for another 5 to 6 minutes, until the cheese is melted and bubbly.
10 - Sandwich the top and bottom bread halves together, press gently, and slice into portions. Serve immediately while hot.