01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - Heat a large skillet over medium heat. Cook ground beef, breaking it apart, until no longer pink. Drain excess fat if needed.
03 - Add chopped onion, green bell pepper, and minced garlic to the skillet. Sauté for 3 to 4 minutes until 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 mixture thickens. Remove from heat.
05 - Slice the baguette in half lengthwise. In a mixing bowl, blend softened butter, minced garlic, parsley, and 1/4 teaspoon salt until evenly combined.
06 - Spread the garlic butter evenly over the cut sides of both bread halves. Place 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. Sprinkle mozzarella and Parmesan cheese evenly over the filling.
09 - Return the filled bread to the oven for 5 to 6 minutes, until cheese is melted and bubbling.
10 - Sandwich the top and bottom bread halves together. Press gently, slice into portions, and serve immediately.