Preheat oven to 350º.

1. Spray mini muffin pans with cooking spray.
2. Combine the first six ingredients in a mixing bowl and beat well with an electric mixer for two minutes.
3. Spoon batter into prepared mini muffin cups, filling each muffin tin halfway.
4. Bake for 12 minutes. Turn out onto a kitchen towel

Glaze:

1. Sift the powdered sugar into a mixing bowl. Add orange juice concentrate, orange zest, vegetable oil, and water. Mix well with a spoon until smooth.
2. Dip each cupcake into the glaze, covering as much of the cupcake as possible.
3. Place on wire racks. Let the glaze set for about an hour.
4. Store in airtight containers.