cooking spray
1 cup plain yogurt
2 eggs
1/3 cup canola oil
2 tablespoons lemon juice
2 tablespoons lemon zest
1 cup sugar
1/4 cup limoncello liqueur
2 cups all-purpose flour
1 1/2 teaspoons baking powder
1/2 teaspoon baking soda
1 pinch salt (optional)
3/4 cup confectioners' sugar
3 tablespoons limoncello liqueur