Preheat and Prep: Preheat your oven to 350°F. Generously coat a 10-inch or 12-inch cast iron skillet with baking pan spray.
Build the Base: Pack the 1/2 cup of brown sugar evenly across the bottom of the skillet to completely cover the iron. Drizzle the maple syrup evenly over the sugar.
Add the Fruit: Drain the pineapple tidbits, reserving all the juice in a separate bowl. Scatter the tidbits evenly over the sugar layer. Nestle the dried cherries among the pineapple.
Mix the Batter: In a large mixing bowl, combine the yellow cake mix, the oil, and the eggs according to the box instructions. Instead of water, use the reserved pineapple juice. Add the remaining 2 tablespoons of brown sugar, cinnamon, allspice, and vanilla extract. Blend well.
Assemble: Carefully pour the spiced batter over the fruit in the skillet, spreading it gently to the edges.
Bake: Bake for 40 minutes, or until the edges are bubbling and the center springs back to the touch.
Flip and Serve: Remove from the oven and let the skillet rest for exactly 5 minutes. Place a large plate upside down over the skillet and carefully, using oven mitts, flip the pan over. Lift the skillet away to reveal the fruit topping.