Add diced onion and cook 3–4 minutes until softened. Stir in minced garlic and cook 30 seconds until fragrant.

4. Simmer Sauce: Mix in ketchup, water, brown sugar, mustard, and Worcestershire sauce. Reduce heat to low, cover, and simmer 20–30 minutes until thick and glossy. Adjust salt & pepper to taste.

5. Assemble & Bake: Spoon the Sloppy Joe mixture onto the ciabatta halves. Top with mozzarella and cheddar. Bake 10 minutes until cheese is bubbly and bread edges are golden.

6. Serve: Let rest 2–3 minutes, then garnish with parsley if desired. Slice into thick strips and enjoy!