In a saucepan, melt butter with brown sugar and corn syrup until smooth. Pour into 9x13 pan.
Break baguette into inch-thick pieces and arrange in casserole to cover.
In a bowl, whisk eggs, milk, vanilla, and salt. Pour evenly over bread and chill 8 hours or overnight.
Preheat oven to 375 degrees and bake 35-40 mins until bread is puffed and brown.
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