In a saucepan combine the corn syrup, brown sugar, and butter. Cook until smooth and bubbly. Spread in the bottom of an 17 x 11-inch baking pan.
Overlap bread slices in pan over syrup.
Pour over bread slices. Allow to set for 15 to 20 minutes. Bake for additional 10 to 15 minutes or until puffed and golden brown. Slice and invert pieces to serve. Garnish with dollops of sour cream.