Preheat oven 325. Grease an 8x8 baking dish. Scatter half the bread in the bottom. Sprinkle with 1/2 cup cheese, then the onion and bacon. Top with the rest if the bread cubes. Whisk the eggs, half and half and salt. Pour this custard over the bread, cover and let soak 20-30 mins. Uncover, sprinkle with the rest of the cheese (more if u like!) and bake approx 35-40 mins. until puffed and set. Let rest 10 mins before serving!!!