Here's a risk-free way to get rich quick: Try our easy take on the classic chocolate-caramel butter bars known as millionaire's shortbread. We swap in crispy, marshmallow-laden rice cereal for its base, and add a thin layer of peanut-butter caramel under the chocolate-shell topping. Just invest a little time to let it chill, and it pays off with every extravagant bite.

Martha Stewart Living, October 2021


Read the full recipe after the video.

Recipe Summary

20 mins
1 hr 15 mins
Makes 16


Ingredient Checklist


Instructions Checklist
  • Brush a 9-inch square baking pan with butter; line with parchment, leaving a 2-inch overhang on two sides. Melt 3 tablespoons butter in a pot over medium heat. Add marshmallows and salt; cook, stirring, until melted. Remove from heat; stir in cereal. Press mixture into prepared pan in an even layer. Let cool 15 minutes.

  • In a small saucepan, combine sugar and 3 tablespoons water. Cover and cook over medium heat, swirling pan a few times, until sugar has dissolved and mixture comes to a boil. Uncover and cook, undisturbed, until mixture turns amber, about 3 minutes more. Remove from heat. Carefully add cream and 2 tablespoons butter (it will bubble up); stir until smooth. Let cool completely, about 1 hour. Whisk in peanut butter. Spread mixture evenly over crust and refrigerate until firm, about 30 minutes.

  • Melt chocolate and remaining 3 tablespoons butter in a small heat-proof bowl set over (but not in) a pot of simmering water, stirring until smooth. Spread evenly over caramel layer. Let stand 5 minutes, then sprinkle with salt and refrigerate until set, at least 30 minutes and up to 24 hours. Lift from pan using overhangs. Using a serrated knife, cut into squares. Refrigerate in an airtight container between pieces of parchment up to 3 days.

Cook's Notes

Let the chocolate shell set a few minutes before sprinkling on flaky salt, so it doesn't sink beneath the surface. The savory crunch lends sophistication to this otherwise kid-centric confection.

To speed up step 2, use store-bought caramels. Simply replace the sugar, cream, and two tablespoons of butter with eight ounces of soft caramels, melted down with three tablespoons of heavy cream.