1Heat oven to 350°F. Spread apple slices evenly over bottom of ungreased 13x9-inch pan. In 1-quart saucepan, heat 1/2 cup brown sugar, the butter and syrup over low heat, stirring occasionally, until melted. Pour syrup mixture over apples.
2In 10-inch skillet, cook sausage over medium heat, stirring occasionally, until no longer pink; drain. Sprinkle sausage evenly over apple-syrup mixture.
3In small bowl, stir remaining ingredients except additional syrup until blended. Carefully pour over sausage.
4Bake 30 to 35 minutes or until top springs back when touched in center. Cut into 3-inch squares; turn each square upside down onto plate. Serve immediately with additional syrup.