When You Can (and Can't) Substitute Mayo for Butter in Baking

Of all the suspicious ingredients to add to cake batter, mayonnaise is certainly at the top of the list. Known for adorning meat-laden sandwiches and turning everything from eggs to Jell-o into a “salad,” mayo doesn’t seem like a customary ingredient for brownies, yet here we are.

Yes, baking with a scoop of…

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