Lemon Blueberry Zucchini Muffins

Preheat oven to 350 degrees Fahrenheit. Grease or line the cups of a standard-size, 12-cup muffin tin. Set aside.
In a large bowl, stir together the flour, sugar, baking powder, and salt.
In a medium bowl, whisk together the eggs, zucchini, milk, oil, and vanilla extract until well-combined.
Add the wet ingredients to the dry and stir until ALMOST combined. Add the lemon zest and blueberries and stir gently until incorporated and just until the dough is combined. Don't overstir or your muffins could end up being tough!
Divide batter between muffin tins.
Bake for about 30 minutes, until the edges of the muffins are golden, the tops are springy, and a toothpick inserted into the middle comes out clean.
Meanwhile, mix together the glaze. Into a small bowl, sift the powdered sugar. Add the lemon juice and stir with a whisk until a thick glaze forms. It should be a bit thicker than glue. (But don't worry, it will taste much better than that!)
Remove muffins from oven and set on a metal rack. Let cool for 5-10 minutes, then transfer muffins to a wire cookie rack placed over paper towels to catch glaze drips.
At this point you have a couple of choices. You can drizzle on the glaze now, knowing that some of it might melt into the warm muffins rather than stay on the top. Or you can wait until they've cooled, then drizzle the glaze on so that it stays on the top. Both methods result in delicious muffins, so it's up to you!
Allow the glaze to solidify, another few minutes.
Devour!