- Preheat your oven according to the Texas toast package instructions. (Trust me, don’t skip this—it matters.) 
- Place the toast slices on a baking sheet and bake until golden, flipping halfway if needed. 
- Meanwhile, in a skillet over medium heat, brown the ground beef with the chopped onion. Drain the grease if you're not into extra shine. 
- Add ketchup, brown sugar, mustard, Worcestershire sauce, salt, and pepper. Stir it all together and let it simmer until thick and glossy. 
- Scoop that sloppy goodness onto your toasted bread, top with shredded cheese, and pop them back in the oven just long enough to melt everything together. 
- Serve immediately—preferably with a side of napkins and zero judgment for seconds (or thirds).