For fluffy mashed potatoes, add softened or melted butter before most of the milk. Coat the mashed potato with butter, then add warm milk gradually until the texture is creamy but not loose.
Why order can make a difference
Butter contributes fat and a rich mouthfeel; milk changes both richness and water content. Coating the potatoes with butter first can help you control how much liquid you need, especially with starchy russets. The effect is less dramatic than choosing the right variety and avoiding overmixing.
A reliable sequence
Cook and drain potatoes, then dry them briefly in the warm pot. Rice or mash while hot. Fold in butter until evenly distributed. Pour in warm milk or cream a little at a time and stop once the texture is right. Season with salt and taste.
Keep everything warm
Cold dairy can cool down the potatoes just as you are finishing them. Warm milk gently without boiling and add it in small amounts. If you use olive oil instead of dairy, drizzle it in gradually and fold with a spatula.
Do not overbeat
A hand masher and a few gentle folds are usually enough. Running the mixture through a blender or food processor can make it gummy whether butter or milk was added first.
Frequently asked questions
Is there a fixed amount of milk per pound? No. The amount depends on potato variety, cooking moisture and your preferred texture.
Can I use cold butter? It will melt into hot potatoes, but softened or melted butter incorporates more evenly.
Further reading: Food Network — choosing potatoes for mashing.
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