Core guide
How to Use Butter in Baking: Cold, Softened or Melted
Use butter according to its job, not according to a single “room temperature” rule.
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Technical guidance on butter, oils and other fats in baking: temperature, melting behaviour, plasticity, emulsions, tenderness, lamination and why different fats are not always interchangeable 1:1.
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Core guide
Use butter according to its job, not according to a single “room temperature” rule.
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For many cakes, muffins and similar batters, 75–80 g neutral oil per 100 g butter is a useful starting range.
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Make puff pastry by enclosing pliable butter in a base dough, rolling and folding the packet repeatedly, and chilling between turns according to its condition.
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Separate three conditions first: overly fatty dough leaves an oily film and tears short; overly wet dough flows without useful tension; under-rested dough noticeably firms after 15–20 minutes.
Texture depends not only on how much fat a dessert contains, but on how much of that fat is solid at working and serving temperature, how it crystallises and how it is organised in the system.
When a cream separates, first identify whether you are dealing with ganache/emulsion, buttercream, whipped cream, or a starch- or gel-set cream.
Room temperature is not one universal number. In butter cakes, butter around 18–21°C / 65–70°F and eggs or liquid dairy around 20–21°C / 68–70°F support creaming and emulsification.
Butter, oil, and lard are not direct substitutes in baking. Butter is a plastic emulsion that can cream and laminate; oil stays liquid and often keeps crumb softer; lard is nearly pure plastic fat that can…
For creaming, butter should be pliable but still hold its shape: light finger pressure leaves a shallow dent, the edges remain visible, and the surface is not greasy or shiny.