Preheat oven to 350 degrees F. Spray an 8-inch by 4-inch loaf pan with cooking spray and set aside.
Place 2 cups chopped strawberries in a medium bowl. Sprinkle with 2 teaspoons sugar and stir to coat. Using a fork, gently mash the berries. You don’t want them completely mashed into a puree because a few chunks are nice.
Place mashed strawberries (plus their juices), melted butter, and applesauce in a large bowl. Use a wooden spoon to mix together.
Add sugar, egg, and vanilla to strawberry mixture. Stir until well blended.
Sprinkle baking soda and salt over mixture and stir until well blended.
Add whole wheat flour and all-purpose flour last, stirring just until combined. Be careful not to over-mix or your bread will be tough.
Pour batter into prepared loaf pan. Bake for 45 minutes - 1 hour, or until brown and toothpick inserted in center comes out clean.
Cool on a wire rack. Remove from pan and slice to serve.