Why did my shortbread turn out greasy?

Shortbread has three ingredients and no chemistry to hide behind. The fat content that makes it short also makes it fragile: butter softens at around 30°C, which is below hand temperature, so every extra minute of handling brings the dough closer to the point where the fat separates rather than staying dispersed through the flour. The distinctive greasy shortbread — an oily sheen, a heavy mouthfeel, sometimes a visible ring of fat on the tin — is that separation happening in the oven.

What you'll need

• Cold block butter
• A shallow tin

Step by step

1. Cream lightly, or not at all.Shortbread is not a cake. Beat the butter and sugar only until combined — not until pale and fluffy. Extra creaming warms the butter and incorporates air that has nothing to hold it.
2. Bring the dough together with your fingertips, briefly.Fingertips are the coolest part of your hands. Press the mixture into a dough rather than kneading it, and stop as soon as it coheres.
3. Chill the shaped dough properly.Press it into the tin or cut the shapes, then chill: 30 minutes in the fridge or 15 in the freezer. It should be genuinely firm going into the oven.
4. Bake in a properly preheated moderate oven.Around 160–170°C. Too cool and the butter melts and runs before the flour sets; too hot and the edges brown before the middle is dry. Preheat fully — see `preheat-the-oven-properly`.
5. Check the butter-to-flour ratio.Classic shortbread is roughly one part sugar, two parts butter, three parts flour by weight. Recipes pushing the butter higher are richer and greasier by design, and are less forgiving of a warm kitchen.
6. Consider replacing some flour with rice flour or cornflour.Around a quarter to a third of the flour weight. Both are traditional in shortbread, both give the characteristic sandy snap, and both absorb fat, which reduces greasiness noticeably.
7. Cool in the tin, and dust while warm.Shortbread is very fragile hot. Score it warm, cool it in the tin, dust with caster sugar while still warm so it sticks, and cut when cold.

Tips

• Pricking shortbread with a fork before baking is not decoration — it lets steam escape so the biscuit dries evenly rather than puffing and then flattening.
• Salted butter in shortbread is a matter of preference and a pinch of salt in a three-ingredient biscuit makes a real difference either way.
• A greasy batch is still perfectly edible and is very good crushed as a base for a cheesecake or a tart.
• Baking shortbread in the tin it was pressed into, rather than as loose shapes, contains any butter that does leak and gives a better result in a warm kitchen.

Common mistakes

• Creaming the butter and sugar until pale and fluffy — That is cake method. In shortbread it warms the butter and adds air the low-liquid dough cannot hold, and greasiness follows.
• Using spreadable or low-fat butter — Both contain added water and oils that behave completely differently. Shortbread needs block butter.

If it doesn't work