Preheat your oven to 350°F (175°C). Grease an 8x8-inch baking dish or line it with parchment paper.

Toast pecans in a skillet over medium heat for 5-7 minutes until fragrant and golden brown. Let them cool.

Peel, core, and chop 1 cup of fresh apples into 1/2-inch pieces.

In a mixing bowl, cream together 1/2 cup butter and 1 cup sugar with an electric mixer for 2-3 minutes. Add 1 egg and blend until creamy.

Slowly add 1 cup flour, 1/2 tsp baking powder, 1/2 tsp salt, and 1/2 tsp cinnamon to the mixture. Mix until just combined.

Fold in the apple pieces and toasted pecans carefully.

Transfer the thick batter into the prepared baking dish, smoothing the top.

Bake for 30-40 minutes until edges are golden and a toothpick inserted comes out with moist crumbs.

Cool the brownies on a wire rack for 15-20 minutes before slicing into squares.