Vanilla Marshmallow Fudge

Why This Vanilla Marshmallow Fudge Works

As the sugar, butter, and evaporated milk boil together, the sugar dissolves and the liquid thickens. The steady boiling drives off some water, so the mixture goes from thin and milky to glossy and syrupy. By the time it has boiled for a few minutes, it is thick enough to hold its shape once it cools, which is what gives the fudge a firm bite instead of staying runny.

Once the hot syrup hits the white chocolate chips, the heat melts them fast and they blend into the syrup, making it creamy. After that, the marshmallow creme goes in and loosens at first, then spreads through everything and makes the mixture fluffy and smooth. As the pan of fudge cools, the sugar and chocolate set up together into a solid block. Cooling in the fridge finishes the job, so the fudge cuts cleanly into squares and stays soft and chewy instead of sticky.

Mistakes To Avoid

Letting the sugar, butter, and evaporated milk boil for too short a time leaves the mixture too thin. The sugar doesn’t fully dissolve and the liquid doesn’t thicken enough, so the fudge sets soft, sticky, and sometimes grainy instead of firm and sliceable.

On the other hand, boiling that mixture too long or over very high heat makes it too thick and concentrated. Once the chocolate and marshmallow go in, the fudge can seize up fast, turn stiff, and set into a dry, crumbly block that’s hard to cut.

Adding the white chocolate chips while the pan is still over the heat often causes scorching or little cooked specks. The chocolate can overheat, turn pasty instead of smooth, and the finished fudge ends up with a rough, slightly chalky texture.

Skipping the full cooling and chilling time keeps the fudge from setting properly. It may look firm on top but stay soft in the middle, so it squashes and bends instead of cutting into clean squares.