Add the apple sauce, egg, vanilla, flour, baking powder, baking soda and the pinch of salt. Mix until combine.
Pour in the blueberries and carefully fold into the batter with a spatula.
Spray a 9x9 square baking dish with cooking spray and pour in the batter.
Sprinkle the remaining blueberries on top of the batter and bake for 35-45 minutes or until a toothpick comes out clean.
Once out of the oven spray with the butter and let cool.
While the bread is cooling, in a bowl combine the yogurt, lemon zest, lemon juice and confectioners' sugar and drizzle over the bread or use as a dipping sauce.
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