Ingredients
- ½ cup all-purpose flour
- ⅛ teaspoon baking powder
- ⅛ teaspoon salt
- 1 cup white sugar
- ½ cup unsalted butter, softened
- 2 eggs
- 2 (1 ounce) squares unsweetened baking chocolate, melted
- ½ teaspoon vanilla extract
- 1 cup coarsely chopped walnuts
- 1 teaspoon powdered sugar, or to taste (Optional)
Directions
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Grease and flour an 8×8-inch square pan.
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Sift flour, baking powder, and salt together in a bowl.
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Beat sugar and butter together in a large bowl with an electric mixer until light and fluffy. Beat in eggs until a smooth batter forms. Beat in chocolate and vanilla extract. Stir in flour mixture until just incorporated; fold in walnuts. Spread batter into the prepared pan.
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Place pan in the air fryer basket. Place on the lowest rack in the air fryer oven and cook at 300 degrees F (150 degrees C) until a toothpick inserted in the center comes out clean, 18 to 25 minutes.
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Cool completely in the pan, about 30 minutes. Cut into 9 squares and sprinkle with powdered sugar.
