Preheat oven to 350℉. Line an 8x4 inch loaf pan with parchment paper.
In a large bowl, add in the applesauce, eggs, olive oil, lemon zest, vanilla and mix until combined. Next, add in the flour, baking powder, salt, sugar and mix until incorporated. Then fold in the blueberries. Transfer to the loaf pan and spread out evenly. Top with more blueberries. Bake for 40-45 minutes or until toothpick comes out clean.