Preheat oven to 350 degrees. Spray 24 mini-muffin tin with non-stick spray.
Combine flour, sugar, baking powder, and salt in a large bowl.
In a small bowl, combine milk, butter, orange zest, orange juice and eggs.
Add wet ingredients to dry ingredients and stir until just combined.
Spoon batter into prepared muffin tin.
Bake 12 to 15 minutes or until set in the center. Muffins will not brown very much.
Mix glaze: Whisk 2 c powdered sugar and 1/2 c orange juice until smooth
Remove from pan and immediately submerge in Orange glaze, coating entire muffin. Allow to drain on a wire rack. Place waxed paper under rack for easy clean up.