Follow these straightforward steps to create your Cranberry Pineapple Upside Down Cake:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan.
2. Prepare the Topping: In a small saucepan, melt the butter over medium heat. Stir in the brown sugar until dissolved. Pour this mixture into the prepared cake pan.
3. Arrange the Fruit: Place the drained pineapple slices on top of the brown sugar mixture. Scatter the fresh cranberries evenly over the pineapple.
4. Mix Dry Ingredients: In a mixing bowl, whisk together the flour, baking powder, and salt. Set aside.
5. Combine Wet Ingredients: In another bowl, beat the granulated sugar and eggs until light and fluffy. Add the vanilla extract and milk, mixing well.
6. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, stirring until just combined.
7. Pour Batter: Carefully pour the batter over the arranged pineapple and cranberries in the cake pan.
8. Bake: Place the cake pan in the preheated oven and bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool: Remove the cake from the oven and let it cool in the pan for about 15-20 minutes.
10. Invert the Cake: Carefully run a knife around the edges of the pan. Place a serving plate over the cake and invert it to release the cake onto the plate.

By following these steps, you will create an incredible Cranberry Pineapple Upside Down Cake that will surely impress anyone who tries it!