Read about these blondies at Bake or Break.
Preheat oven to 350°. Grease an 8-inch square baking pan.
Whisk together flour, baking powder, and salt. Set aside.
Using an electric mixer on medium speed, beat butter and brown sugar until smooth. Add eggs, one at a time, mixing until combined after each addition. Mix in vanilla.
Reduce mixer speed to low and gradually add flour mixture, mixing until combined. Stir in cashews.
Spread batter evenly in prepared pan. Bake 35-40 minutes, or until a toothpick inserted in the center comes out with moist crumbs. Cool completely before cutting into bars.
*If using salted cashews, you may want to reduce salt to 1/2 teaspoon.