Got this recipe from a magazine. It called for raspberries but I didn't have any so I used strawberries instead. Quite tasty! I think one could substitute white chocolate chips for the nuts and it would be delicious as well. These are so easy to make and satisfy a sweet tooth. Especially if you want something that's not chocolate. I know that doesn't happen very often for me but sometimes it's nice just to have something different.
Preheat oven to 350 degrees F. Line a 8 or 9 inch square pan with foil. Spray foil lightly with nonstick spray.
In a small bowl, combine flour, baking powder and salt; set aside.
In a medium saucepan, melt butter over low heat. Stir in brown sugar just until moistened. Remove from heat and let cool slightly. Whisk in egg and vanilla. Stir in flour mixture just until combined. Stir in nuts.
Scrape batter into prepared pan, smoothing out and spreading to edges. Scatter strawberries over batter.
Bake until set in center, about 30 minutes. Cool completely in pan on wire rack. Refrigerate for at least 1 hour before cutting. Lift out of pan by foil and cut into 16 bars. Serve.