1Heat oven to 350°F. Spray bottom only of 13x9-inch pan with cooking spray. In large bowl, stir gingerbread mix, water and egg with fork until blended. Stir vigorously about 2 minutes until well mixed. Pour into pan. Bake 18 to 20 minutes or until toothpick inserted in center comes out clean.
2Meanwhile, drain pears into 2-cup glass measuring cup, reserving 3/4 cup pear liquid. Add 1/2 cup of the pie filling to pear liquid. Microwave uncovered on High 1 to 2 minutes or until heated; stir with wire whisk until smooth. Refrigerate pears and remaining pie filling.
3Prick top of warm cake in several places with fork. Pour warm lemon sauce over cake; spread evenly. Cool cake completely, about 1 hour.
4Cut cake into 1 1/2-inch squares. In large bowl, beat whipping cream with electric mixer on high speed until thickened. Slowly beat in remaining pie filling; continue beating until thickened. Place 1/3 of the cake cubes in bottom of 2-quart clear glass bowl. Spread with 1/3 of the cream mixture. Arrange 1/3 of the pears on cream mixture. Repeat layers twice with cake, cream mixture and pears. Cover; refrigerate at least 12 hours.