Stop Ruining Your Bakes: What 3/4 Stick of Butter Actually Equals in Cups
Butter is an emulsion containing roughly 80% to 82% milk fat, 16% to 18% water, and roughly 1% milk solids. Substituting a half cup of butter (eight tablespoons) when a recipe specifies three-quarters of a stick (six tablespoons) injects an extra 28 grams of fat and liquid into your batter. In cookie dough, that extra fat melts during baking, causing excessive puddling and greasy edges. The excess water turns into steam, overdeveloping gluten and yielding rubbery texture instead of tender crumb.
In pie dough, fat coats flour proteins to restrict gluten formation. Adding too little butter turns crusts dense and tough. Adding too much prevents the flour from absorbing required hydration, making dough crumble apart before rolling. Consistent measurements protect the balance between shortening power and moisture content.