Preheat oven to 375. In a 9x9 baking pan, add ⅓ cup of melted unsalted butter and ⅔ cup of light brown sugar.
Mix and spread evenly.
Open the can of pineapples and drain the pineapple juice into a separate bowl or cup, and set aside.
Cut the pineapple slices in half and place them on top of the mixture; add the cherries.
Chop the praline pecans into small pieces and scatter them evenly over the pineapple and cherries.
Combine 1 cup of Bob's Red Mill Organic all-purpose flour, 1 tsp baking powder, and ¼ tsp salt in a mixing bowl, then mix well. Set aside.
Add the 3 egg whites and 1 cup of sugar to the bowl of a stand mixer, and mix until thick, pale, and frothy, not stiff peaks. But definitely aerated.
Next, add the yolks and continue to mix for another minute.
Add 1 tbsp melted butter, vanilla extract, and the reserved pineapple juice to the stand mixer bowl, then mix until well combined.
Add the flour mixture to the stand mixer bowl a little at a time, fully incorporating it into the mix. Be careful not to over-mix.
Pour the cake batter over the pineapples, light brown sugar, and cherries.
Place on the center rack of the oven and bake until the cake is set, about 20-25 minutes, or until a toothpick comes out clean.
Let the pineapple cake cool in the pan for about 5 minutes.
Run a knife around the edges. Then place a cake stand or platter on top of the pan, grip firmly, and flip in one motion.
Serve with whipped cream or ice cream. Optional: Drizzle the top with Praline Pecan sauce. (recipe below).