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 with a spoon. Drain excess fat if needed.
03 - Add onion, green bell pepper, and minced garlic to skillet. Sauté 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 thickened. Remove from heat.
05 - Slice baguette in half lengthwise. In a small bowl, combine softened butter, finely minced garlic, chopped parsley, and 1/4 teaspoon salt.
06 - Spread garlic butter evenly over both bread halves. Arrange cut side up on prepared baking sheet.
07 - Bake in preheated oven for 5 to 6 minutes until lightly golden. Remove from oven.
08 - Generously distribute sloppy joe filling onto one half of each bread loaf. Sprinkle mozzarella and Parmesan cheese on top.
09 - Return bread to oven and bake for an additional 5 to 6 minutes, until cheese is melted and bubbly.
10 - Sandwich top and bottom halves together, press gently, and cut into desired portions. Serve hot.