Chocolate Chip Blondies

Name: Chocolate Chip Blondies
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Yield: 15
Ingredients: Ingredients; 1/2 cup (1 stick) unsalted butter, melted and cooled slightly; 1 cup packed light brown sugar; 1 large egg; 1 teaspoon vanilla extract; 1 cup all-purpose flour; 1/2 teaspoon baking powder; 1/4 teaspoon salt; 3/4 cup semi-sweet chocolate chips; 1/2 cup chopped walnuts or pecans (optional)