Preheat oven to 350°F. Prepare pan with shortening and flour or baking spray. In small bowl, mix together flour, baking soda, cinnamon and salt and set aside. In another bowl, blend brown sugar, butter and eggs. Add vanilla, yogurt, and flour mixture. Blend until smooth. Pour into prepared Mini Bundt Cupcake Pan, filling each cavity 3/4 full and tap gently on counter to release air bubbles. Bake for 15-25 minutes or until toothpick inserted into center of cake comes out clean. Remove from oven and let cool for 10 minutes before inverting onto a cooling rack. Decorate as desired. Makes 12 mini cakes.