Pineapple Skillet Upside-Down Cake

1. Preheat Oven and Prepare Skillet

Preheat the oven to 190 degrees Celsius (375 degrees Fahrenheit). Melt the unsalted butter in a 10-inch ovenproof skillet over medium heat until it turns a nut-brown color. Then, sprinkle the dark brown sugar evenly over the melted butter and arrange the pineapple cubes on top.

2. Mix Dry Ingredients

In a large bowl, whisk together the all-purpose flour, whole wheat flour, salt, baking soda, and baking powder.

3. Prepare Wet Ingredients

In a medium bowl, combine the browned butter from the skillet with white sugar, then whisk in the large egg and buttermilk until smooth.

4. Combine and Bake

Pour the wet mixture into the dry ingredients and whisk together until smooth. Pour this batter over the pineapple in the skillet, ensuring it covers the fruit completely. Bake in the preheated oven for about 35 minutes, or until golden brown and springy in the center.

5. Cool and Serve

After baking, allow the cake to cool in the skillet on a wire rack for 10 minutes. Invert the cake onto a plate to reveal the caramelized pineapple topping.