01 - Preheat oven to 350°F (175°C). Lightly grease a 9x13-inch baking pan and line with parchment paper for easy removal.
02 - In a medium skillet over medium heat, melt butter. Add diced apples, cinnamon, and sugar. Sauté for 5–7 minutes until apples are tender but not mushy. Set aside to cool.
03 - In a large bowl, whisk together flour, baking powder, and salt until well combined.
04 - In a separate bowl, mix melted butter and brown sugar until smooth. Beat in eggs and vanilla extract until fully incorporated.
05 - Fold the dry ingredients into the wet mixture using a spatula until no streaks remain. Avoid overmixing for optimal texture.
06 - Spread half of the blondie batter evenly in the prepared pan. Evenly distribute the cooled apple filling over the base. Spread remaining batter gently on top, covering the apples.
07 - Bake for 28–33 minutes, or until the top is golden brown and a toothpick inserted into the center comes out with a few moist crumbs.
08 - Allow blondies to cool completely in the pan on a wire rack. Drizzle caramel sauce evenly over the cooled surface. Slice into squares and serve.