The Ultimate Caramel Slice Troubleshooting Guide: Never Make a Runny Layer Again

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Q1: Why did an oily layer separate out on top of my caramel?

A1: Fat separation happens when the pan gets too hot or the caramel is boiled too aggressively without steady whisking. The butter breaks out of the milk emulsion. If this starts happening on the stove, pull the pan off the burner immediately and vigorously whisk in one to two tablespoons of boiling water to help pull the emulsion back together.

Q2: Can I salvage a caramel slice if the caramel layer stays runny after chilling?

A2: Yes, though it requires some effort. If you have not added the chocolate yet, scrape the runny caramel back into a saucepan and cook it over medium-low heat until it reaches 228°F (109°C). If you already poured the chocolate, scoop the entire filling into an oven-safe bowl, warm it gently to blend, and repurpose it as a rich dessert sauce for ice cream or bread pudding.

Q3: Should I keep millionaire's shortbread in the fridge or at room temperature?

A3: Store the sliced portions in an airtight container in the refrigerator for up to 7 days, separating layers with parchment paper. For the best flavor and texture, pull slices out of the fridge about 15 minutes before serving so the shortbread softens slightly while the caramel stays firm.