Combine light corn syrup, butter, and sugar in a saucepan; simmer until syrup-like. Pour mixture over the bottom of a 9x13-inch pan.

Slice bread into 12 to 16 slices; place over the syrup. Layer as needed.

Beat together eggs, milk, vanilla, and salt. Pour over bread. Cover with plastic wrap. Refrigerate 8 hours or overnight.

Preheat the oven to 350 degree F (175 degrees C).

Bake in the preheated oven for 45 minutes.

Cut into squares. Invert and serve.