01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large skillet over medium heat, brown ground beef, breaking it into crumbles as it cooks. Drain any excess fat if needed.
03 - Add chopped onion, bell pepper, and minced garlic to the skillet. Cook for 3 to 4 minutes until the 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, blend softened butter with minced garlic, chopped parsley, and 1/4 teaspoon salt until evenly combined.
06 - Spread the garlic butter evenly over the cut sides of both bread halves. Place bread cut side up on the lined baking sheet.
07 - Bake for 5 to 6 minutes, or until the bread is lightly golden and crisp. Remove from oven.
08 - Spoon the sloppy joe filling generously onto the cut side of one bread half. Sprinkle with mozzarella and Parmesan cheese.
09 - Return the filled bread to the oven for 5 to 6 minutes, or until the cheese is melted and bubbly.
10 - Place the top bread half over the filling, press gently, then cut into serving portions. Serve hot.