Ingredients
- 1 tablespoon unsalted butter, at room temperature, plus more for the baking dish
- 10 slices thick-cut bacon, finely chopped
- 1 large onion, thinly sliced
- 3 cups half-and-half
- 1/4 cup grated Parmesan
- 10 large eggs
- Kosher salt and freshly ground black pepper
- One 12-ounce loaf challah bread, crusts removed, cut into 1-inch cubes, preferably stale (about 6 cups)
- 2 cups shredded Swiss cheese
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