Apple Brownies

Adapted from this Martha Stewart recipe
Yield: 1 8x8 square pan, or 9 2.5-inch squares

1/2 cup butter, melted
1 cup sugar
1 egg
1/2 cup walnuts, chopped
1 firm-sweet apple, peeled, cored, cut into 1/2-inch cubes
1 cup all-purpose flour
1 tsp cinnamon
1/2 tsp baking powder
1/4 tsp baking soda
1/2 tsp salt
  1. Preheat oven to 350F.
  2. Line an 8-inch square baking pan with parchment, leaving a slight overhang on all sides.
  3. In a mixing bowl, combine butter, sugar, and egg and whisk until pale, about 2 minutes.
  4. Add walnuts and apples and mix slightly.
  5. In a small bowl, combine flour, cinnamon, baking powder, baking soda, and salt. Add to mixture and stir in just until combined.
  6. Scrape batter into pan and bake until toothpick inserted into center comes out clean, about 20 minutes.
  7. Cool completely.