Preheat oven to 350° F. Chop the apples, grate the orange peel, and set aside. Coat the baking pan with cooking spray.
In a large bowl combine the 1 1/2 cups flour, 1/2 cup sugar, baking powder, and salt.
Cut in 6 tablespoons butter using a pastry blender or 2 forks.
In a separate bowl mix together the eggs, vanilla, and yogurt.
Add the yogurt mixture to the flour and mix well. The batter will be thick.
Stir in the apples and orange peel and mix until incorporated.
Using a small cookie scoop to divide the batter into each pan well. Bake at 350° F for about 20-25 minutes.
When Bundts are done, remove from oven and place on a cooling rack and set the Bundts right side up and while hot.
Topping
In a small bowl melt the remaining 5 tablespoons butter.In a separate bowl mix the sugar and cinnamon.
Brush each Bundt top with butter then sprinkle with the cinnamon sugar.
Notes
Use a Recipe Specific for Bundt Cakes: Bundt cakes require a specific texture and density to maintain their shape and detail. Using a recipe formulated for bundt cakes will give you the best results.Prepare the Pan Properly: To ensure your cakes release easily, take the time to grease and flour your mini bundt cake pans properly. Using a baking spray that contains flour can be especially effective.Don’t Overfill the Pans: Only fill the mini bundt pans about 2/3 full. This will prevent them from overflowing as they bake.Check for Doneness Early: Mini bundt cakes will bake faster than a full-sized bundt cake. Start checking for doneness around the halfway mark of the baking time recommended for a full-sized cake.Allow to Cool Before Removing: Let the cakes cool in the pan for about 10 minutes before you attempt to remove them. This cooling time helps the cake to set and makes it less likely to break when you remove it from the pan.Loosen the Edges: Use a small silicone spatula or butter knife to gently loosen the cake from the edges of the pan before inverting. This can help the cake release more easily.Practice Patience: If a cake doesn’t release immediately, give it a few more minutes. Sometimes, the cakes need a bit more time to pull away from the sides of the pan.Decorate Thoughtfully: One of the charms of bundt cakes, mini or otherwise, are their intricate designs. Simple decorations like a powdered sugar dusting or a glaze drizzle often work best, allowing the cake's design to shine.Store Properly: If not serving immediately, store the cakes in an airtight container to keep them fresh. If you've glazed your cakes, wait until the glaze has completely set before storing them.