Step 1

Preheat oven to 350 degrees F (175 degrees C). Grease and flour two 8-inch pans.

Step 2

Beat cake mix, water, egg whites, vegetable oil, and lemon extract together in a bowl using an electric mixer on medium speed until batter is well combined, about 2 minutes. Pour batter into prepared pans.

Step 3

Bake in the preheated oven until a toothpick inserted in the center of the cake comes out clean, 25 to 30 minutes. Cool in pans for 10 minutes before transferring it to a wire rack to cool completely.

Step 4

Beat cream in a chilled bowl using an electric mixer until soft peaks are almost forming into stiff peaks; place bowl in refrigerator.

Step 5

Beat cream cheese, sugar, and vanilla extract together in a separate bowl using an electric mixer until smooth and creamy. Fold whipped cream into cream cheese mixture.

Step 6

Place 1 cake on a plate; top with blueberry pie filling. Place second cake atop blueberry filling. Generously frost cake with whipped cream cheese frosting.