Preheat the oven to 350 degrees F.
Spray a 12 cup muffin pan with cooking spray.
In a large bowl, whisk together the sugar, lemon zest, yogurt, milk, lemon juice, vanilla extract, and egg.
Whisk in the coconut oil until well combined.
Add the flour, baking powder, baking soda, and salt, stirring in with a rubber spatula until combined.
Evenly divide the batter between the 12 muffin cups.
Bake in the preheated oven for 15-17 minutes, until the tops spring back
Once the muffins are cool, make the glaze.
In a small bowl, whisk together the powdered sugar, lemon juice, and milk.
Drizzle over the muffins.