Wild Blueberry & Walnut Blondies - Wild Blueberries

Ingredients

• Cooking spray
• ¾ cup frozen Wild Blueberries
• 1 cup plus 2 teaspoons all-purpose flour
• ¾ cup sugar
• 1 egg
• 6 tablespoons butter, melted
• 1 teaspoon vanilla extract
• 1 teaspoon baking powder
• ¼ teaspoon salt
• ½ cup chopped walnuts
• powdered sugar for garnish