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 it up with a spoon. Drain any excess fat.
03 - Add chopped onion, green bell pepper, and minced garlic to the skillet. Sauté for 3 to 4 minutes until vegetables soften.
04 - Stir in tomato sauce, tomato paste, ketchup, Worcestershire sauce, smoked paprika, brown sugar, salt, black pepper, and oregano. Simmer uncovered 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, parsley, and salt.
06 - Spread garlic butter evenly over both bread halves. Place cut side up on prepared baking sheet and bake for 5 to 6 minutes until lightly golden.
07 - Remove bread from oven. Spoon Sloppy Joe mixture liberally onto one half of each bread piece. Sprinkle mozzarella and Parmesan cheese on top.
08 - Return bread to oven for 5 to 6 minutes, until cheese is melted and bubbly.
09 - Place remaining bread halves on top, press gently to sandwich, and slice into portions. Serve immediately while hot.