I can substitute ordinary butter for whipped, but I melted it first and one stick of butter is equal to 1/2 cup of melted butter. Thanks for the feedback. The cake was delicious. uumm
Unless the recipe specifies whipped butter, you should use regular butter. If the recipe specifies whipped, use whipped ( this is for baking, where it's important). If it's to flavor a sauce, I'd add the butter slowly up to the amount in the recipe; non-whipped butter is oilier, whipped butter has more water.
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