Preheat the oven to 350 degrees F (175 degrees C). Grease or line a 12-cup muffin tin with paper liners.
Combine almond flour and baking soda in a large bowl.
Combine blueberries, eggs, vanilla extract, and lemon zest in a separate bowl. Pour into flour mixture and mix well. Pour evenly into the prepared muffin tin.
Bake in the preheated oven until a toothpick inserted into the center of a muffin comes out clean, about 20 minutes. Remove from the oven and sprinkle with confectioners' sugar.