"This hearty strata is inspired by dish commonly found in beer halls throughout Germany, called kaese spaetzle...."
INGREDIENTS
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1 (1 pound) baguette, cut into 2 inch cubes
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2 tablespoons butter, divided
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3 small onions, finely sliced (about 3 cups)
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Kosher salt and freshly ground black pepper
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8 slices bacon, cut into 1/2-inch pieces
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1 cup shredded swiss cheese
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1 1/2 cup milk
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5 eggs, beaten
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1/3 cup sour cream