My sister-in-law took just a bite and came running over to me asking for this recipe

Instructions:
Preheat oven: Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
Prepare bread: Slice the loaf of bread lengthwise into two halves. Place both halves on the baking sheet, cut side up.
Make garlic butter: Combine butter and garlic salt in a small bowl. Spread the mixture over the cut sides of the bread.
Cook sloppy joe filling: In a medium nonstick skillet over medium heat, cook ground beef and onions until the beef is no longer pink (8-10 minutes). Drain grease. Stir in garlic powder, mustard, ketchup, salt, pepper, and water.
Assemble sandwiches: Divide sloppy joe mixture between both sides of the bread. Top with mozzarella and cheddar cheese.
Bake: Bake for 12-14 minutes, or until golden brown.
Serve: Cut into pieces and serve with parsley for garnish.