01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large skillet over medium heat, cook the ground beef until browned, breaking it into small pieces as it cooks. Drain excess fat if necessary.
03 - Add chopped onion, green bell pepper, and minced 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 the mixture is thickened. Remove from heat.
05 - Slice the baguette in half lengthwise. In a small bowl, combine softened butter, finely minced garlic, chopped parsley, and 1/4 teaspoon salt.
06 - Spread the garlic butter evenly over both bread halves. Place the bread cut side up on the prepared baking sheet.
07 - Bake for 5 to 6 minutes until the bread is lightly golden. Remove from oven.
08 - Generously spoon the sloppy joe filling onto one half of each bread piece. Sprinkle evenly with shredded mozzarella and grated Parmesan cheese.
09 - Return to the oven for 5 to 6 minutes, until cheeses are melted and bubbling.
10 - Sandwich the top and bottom bread halves together, press gently, and slice into servings. Serve immediately while hot.