4. Add the toffee crunch
Sprinkle the crushed Heath bars over the cake. Refrigerate until fully cooled.
5. Make the whipped cream
Beat the heavy cream with sugar until stiff peaks form.
6. Frost & garnish
Spread the whipped cream over the cooled cake. Finish with the reserved Heath crumbs and, if you like, an extra drizzle of caramel. Chill for several hours—or overnight—for the best flavor.
Tips & Variations
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✦ For a lighter version, use reduced-fat cake mix.
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✦ Swap the toppings with chopped pecans, mini chocolate chips, or both.
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✦ Make ahead—the flavor deepens beautifully when chilled overnight.