Preheat oven to 350 degrees F. Spray muffin pan with cooking spray.
In large bowl, combine flour, baking powder, and salt. Set aside.
In medium bowl, beat 2 eggs well, then add canola oil and sugar. Blend well.
Add buttermilk, lemon juice, and lemon zest and blend well.
Fold in zucchini.
Add wet mixture to dry ingredients and mix until just combined. Don't over mix.
Pour into prepared muffin pan. Bake in preheated oven for 15-18 minutes, or until toothpick comes out clean.
While muffins are baking, make the glaze.
Mix powdered sugar and lemon juice until well blended.
Drizzle over cooled muffins. Let glaze set and enjoy!