Step 1

Preheat oven to 325F. Grease a 13 x 9 inch baking pan with baking spray.

Step 2

In a large bowl combine flour, baking soda, and salt in a large bowl. Mix well.

Step 3

Using a hand mixer or stand mixer, in a medium bowl, beat sugar and butter for about 3 minutes.

Step 4

Add egg and egg whites one at a time and beat until combined. Add buttermilk, vanilla and applesauce until incorporated.

Step 5

Add wet ingredients to the flour mixture and stir until just blended. Gently fold in blueberries.

Step 6

Place the batter into the prepared cake pan; bake cake until a toothpick comes out clean, about 30-32 minutes.

Step 7

Serve room temperature.