Preheat oven to 350°F (175°C). Line or grease a muffin pan.
In a large bowl, whisk together flour, baking powder, baking soda, salt, coconut sugar, and lemon zest.
In another bowl, mix melted coconut oil, plant-based milk, lemon juice, vanilla, and eggs until combined.
Add wet ingredients to dry and stir just until combined. Do not overmix.
Fold in blueberries gently using a spatula.
Divide the batter evenly into muffin cups.
Bake for 18-22 minutes or until a toothpick comes out clean.
Let muffins cool. Mix powdered sugar and lemon juice to form glaze, then drizzle over muffins.