Brown sausage and onion in skillet over medium-high heat until sausages is browned. Drain fat; mix sage and 1/2 teaspoon maple favoring into the meat. Set aside.

Heat corn syrup, butter and brown sugar in a saucepan over medium heat until butter is melted and sugar is dissolved. Pour mixture into an 8-inch square baking dish. Place 4 slices of bread in a single layer over the syrup ( use an additional slice, trimmed to fit, if needed to cover bottom of pan ) top with the sausage, then place the remaining 4 to 5 slices of bread on top of sausage.

Whisk together eggs, milk, vanilla, 1 teaspoon maple favoring and salt. Carefully pour over bread. Cover; refrigerated 8 to 24 hours.

preheat over to 350°F. Bake uncover for 35 to 45 minutes. Remove from oven; let stand 5 to 10 minutes. Cut into squares. inverted each piece when serving.