Creating Irresistible Peach Upside-Down Mini Cakes is a straightforward process. Follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and flour six to eight mini cake pans.
2. Prepare the Peaches: In a medium skillet, melt the butter over medium heat. Add the sliced peaches, brown sugar, and cinnamon. Cook for about 5-7 minutes until the peaches are slightly softened and caramelized. Remove from heat.
3. Arrange Peaches: Evenly distribute the peach mixture among the mini cake pans, ensuring the peaches are laid neatly.
4. Mix Dry Ingredients: In a bowl, whisk together flour, baking powder, and salt.
5. Combine Wet Ingredients: In another bowl, mix granulated sugar, egg, vanilla extract, and milk until well combined.
6. Combine Mixtures: Gradually stir the wet ingredients into the dry ingredients until just combined.
7. Pour Batter: Carefully pour the batter over the caramelized peaches in each mini cake pan.
8. Bake: Place the pans in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool: Remove from the oven and allow the mini cakes to cool in their pans for about 10-15 minutes.
10. Invert Cakes: Run a knife around the edges of the pans, then invert onto a serving platter or wire rack to cool completely.

By following these steps, you will create an incredible dessert that is both visually appealing and delicious!