1. **Cook the Beef Mixture**: In a large non-stick skillet over medium heat, melt the butter. Add the chopped onion and green bell pepper, and sauté until they begin to soften, about 3-5 minutes. Add the ground beef, cooking and crumbling until it’s no longer pink. Drain any excess grease.

2. **Prepare the Sloppy Joe Sauce**: To the skillet with the beef, add ketchup, water, brown sugar, Worcestershire sauce, red wine vinegar, chili powder, salt, and black pepper. Stir well to combine. Reduce heat to low and let the mixture simmer for 20 minutes, stirring occasionally.

3. **Bake the Texas Toast**: While the beef mixture is simmering, preheat the oven and prepare the garlic Texas toast according to the package instructions. Place the slices on a baking sheet and bake until golden brown.

4. **Assemble the Sloppy Joes**: Once the Texas toast is ready, keep the slices on the baking sheet. Spoon the sloppy joe mixture evenly over each slice of toast. Top each with a generous amount of shredded mozzarella cheese.

5. **Melt the Cheese**: Return the baking sheet to the oven and bake for an additional 5 minutes, or until the cheese is melted and bubbly.

6. **Serve**: Remove from the oven and serve immediately.