Preheat oven to 350 degrees. Liberally coat with baking spray, or grease and flour 12 mini-bundts (or one 9″ bundt pan or pans for 24 cupcakes).
In a medium bowl, sift together the flour, baking soda, and salt. Set aside. In another small bowl, stir together the yogurt and the milk just until smooth.
Beat together the butter, sugar, and lemon zest for about 5 minutes, until smooth and light. Be sure to scrape the sides of the bowl periodically.
Add in the eggs one a time, still at medium speed, scraping down the bowl between each addition. Mix well after each egg.
With your mixer on low speed, add in the flour mixture alternately with the yogurt in three additions. Start and end with the flour mixture. Mix just until the batter is incorporated and then increase the speed to medium and mix until the entire mixture is smooth and light (about 2 minutes).
Mix in the orange juice and the limoncello on low speed for about a minute until blended.
Spoon the batter carefully into a pastry bag and pipe evenly into your pan(s); smooth the top of the batter.mixed, no more than 30 seconds
Bake about 15 minutes or until the center of a toothpick inserted in the center emerges clean.Do not wait for the exposed part of the mini-bundts to look golden brown). If you make cupcakes, the baking time should be about the same and at least an hour for one large bundt cake. Check the time on a large bundt at about 40
minutes. Every oven is different.
Allow the mini-bundt pans to cool about 10 minutes before inverting the pans onto a cooling racks to remove the cakes. For a large bundt cake, let it cool completely before inverting onto your serving plate.
In a small bowl, whisk together the orange juice and powdered sugar to make the icing. When the cakes have cooled, drizzle on the icing.