Preheat oven to 425°F. Arrange Texas toast on a rimmed baking sheet.
Par-bake the Texas toast for 5 minutes to lightly crisp the tops. Set aside.
Meanwhile, heat a large skillet over medium-high. Add ground beef, onion, and bell pepper. Cook, breaking up meat, until beef is browned and vegetables are tender, 5 to 7 minutes. Drain excess fat.
Stir in garlic and cook until fragrant, 0.5 minute.
Add ketchup, tomato sauce, Worcestershire, mustard, brown sugar, chili powder, smoked paprika, salt, and pepper. Reduce heat to medium and simmer until thick and saucy, 5 to 7 minutes.
Spoon the sloppy joe mixture evenly over the par-baked Texas toast. Top with shredded cheddar.
Return to oven and bake until cheese is melted and edges are golden, 4 to 6 minutes. Garnish with parsley and serve 2 loaded toasts per person.
Notes
For a lighter option, use ground turkey. Add a pinch of crushed red pepper for heat, or swap cheddar for pepper jack. Broil for the final 1 to 2 minutes for extra color—watch closely.