Preheat oven to 350°. Generously butter or spray a 12-cup standard muffin pan.*
Whisk together flour, baking soda, and salt. Set aside.
Beat butter and brown sugar until light and fluffy. Add eggs and vanilla, and mix until combined. Gradually add flour mixture, mixing just until combined. Be sure not to overmix. Stir in chocolate chips and toffee chips.
Spoon batter evenly into prepared pan. Bake 18-22 minutes, or until a toothpick inserted into the center comes out clean.
Cool in pan on wire rack for about 10 minutes. Then, remove cupcakes from pan to cool completely.
Makes 12 blondies.
*These can also be made as bars in an 8-inch square pan. Bake for about 35 minutes or until they pass the toothpick test.