- 1 stick salted butter, melted and cooled, plus more for dish
- 1 cup all-purpose flour
- 1 teaspoon ground cinnamon
- 1/2 teaspoon baking powder
- 1/2 teaspoon salt
- 1/4 teaspoon baking soda
- 1 cup sugar
- 1 large egg
- 1/2 cup chopped walnuts
- 2 large firm-sweet apples (about 1 pound total), peeled, cored, and cut into 1/2-inch cubes (2 3/4 cups
Preheat oven to 350 degrees with rack in center position. Generously butter an 8-by-11-inch baking dish.
Whisk together flour, cinnamon, baking powder, salt, and baking soda in a medium bowl. In a separate bowl, beat together butter, sugar, and egg with a mixer until pale, about 2 minutes. Add walnuts and apples, and stir by hand until combined. Add flour mixture, and stir until combined, about 30 seconds more.
Spread batter in pan, and bake until golden brown and slightly firm, about 40 minutes. Let cool on a wire rack 30 minutes, then cut into 12 bars.