I found this recipe at Taste of Home. It is simple and pretty tasty. There is something about a melted Snickers that adds great flavor. The kids were happy when I made them and there were none left the next morning.
Candy Bar Blondies
1 package yellow cake mix
1/2 cup brown sugar
1/2 cup butter, melted
3 Snickers candy bars, chopped
In a large bowl, combine the cake mix, brown sugar, butter and eggs until well blended. Stir in chopped candy bar.
Spread into a greased 9 x13 pan. Bake at 350 degrees for 25-30 minutes or until a toothpick comes out clean.
*You could also use a chocolate cake mix. I think other candy bars would be great also; Twix, Milky Way...mmmmm I might need to make some more.