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 pieces as it cooks. Drain excess fat if needed.
03 - Add onion, green bell pepper, and minced garlic to the skillet. Sauté 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 oregano. Simmer for 8 to 10 minutes until thickened. Remove from heat.
05 - Slice the baguette in half lengthwise. In a small bowl, blend softened butter with minced garlic, chopped parsley, and salt.
06 - Spread garlic butter evenly over each bread half and arrange cut side up on the prepared baking sheet. Bake for 5 to 6 minutes until lightly golden. Remove from oven.
07 - Spoon sloppy joe filling generously onto one side of each bread half. Sprinkle with mozzarella and Parmesan cheese.
08 - Return the bread to the oven for 5 to 6 minutes, until the cheese is melted and bubbly.
09 - Sandwich the two bread halves together, pressing gently to secure. Slice into portions and serve immediately.