01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Heat a large skillet over medium heat. Add ground beef and cook until evenly browned, breaking apart with a spoon. Drain excess fat as needed.
03 - Add chopped onion, green bell pepper, and minced garlic to the skillet. Sauté for 3 to 4 minutes, stirring until vegetables soften.
04 - Incorporate tomato sauce, tomato paste, ketchup, Worcestershire sauce, smoked paprika, brown sugar, salt, black pepper, and dried oregano. Simmer uncovered for 8 to 10 minutes, stirring occasionally, until the mixture thickens. Remove from heat.
05 - Slice the baguette in half lengthwise. In a mixing bowl, combine softened butter with minced garlic, chopped parsley, and salt. Mix thoroughly.
06 - Spread garlic butter evenly over each bread half. Arrange cut side up on the prepared baking sheet. Bake for 5 to 6 minutes until lightly golden.
07 - Generously layer hot sloppy joe filling onto one half of the bread. Sprinkle evenly with shredded mozzarella and grated Parmesan cheese.
08 - Return to the oven for 5 to 6 minutes, or until cheese is melted and bubbly.
09 - Place remaining baguette half on top to form sandwiches, press gently, and slice into portions. Serve immediately.