Preheat oven to 400ºF.
In a measuring cup, combine lemon juice and 2/3 cup milk. Let this mixture sit
for a couple minutes to allow the milk to sour.
In a large mixing bowl, whisk together flour, sugar, baking powder, and salt.
In a medium mixing bowl, beat milk mixture, oil, and eggs.
Pour wet ingredients into dry ingredients and mix until combined.
Add lemon zest. Beat until just blended.
With a spoon, fold cranberries into batter.
Prepare a muffin tin with liners.
Fill each liner 2/3 full.
Bake for 22 minutes or until a toothpick comes out clean.
Prepare icing by combing powdered sugar and milk.
If icing is too thick, add more milk. If it is too thin, add a bit more powdered sugar
Drizzle over baked muffins and enjoy!