2 cups all-purpose flour 1 cup packed brown sugar 1/2 cup granulated sugar 1/2 cup butter or margarine, softened 1/2 cup finely chopped Butterfinger candy bar 1 teaspoon baking soda 1/2 teaspoon salt 1/2 cup milk 1/2 cup plain yogurt 1 large egg 1 teaspoon vanilla extract
Preheat oven to 350° F. Grease 8-inch-square baking pan.
Combine flour, brown sugar and granulated sugar in medium bowl; cut in butter with pastry blender or two knives until mixture resembles coarse crumbs. Transfer 1/2 cup flour mixture to medium bowl; stir in Butterfinger pieces.
Stir baking soda and salt into remaining flour mixture. Combine milk, yogurt, egg and vanilla extract in small bowl until blended. Add to flour mixture; stir just until blended. Pour into prepared pan; sprinkle evenly with Butterfinger mixture.
Bake for 40 to 45 minutes or until wooden pick inserted in center comes out clean. Cool slightly in pan on wire rack. Serve warm.