Is Oil Or Butter Better To Use In Carrot Cake? - Tasting Table
Briefly

Fat is essential in baking, specifically for maintaining a tender crumb structure in carrot cakes, as it prevents flour from absorbing excessive water.
Choosing oil over butter for baking carrot cake is crucial because oil contains a higher fat content, resulting in a moist, evenly rising cake.
Using oil not only enhances the texture of carrot cake but also extends its shelf life, complemented by the natural moisture of grated carrots.
Oil-based cakes remain fresher longer and are more accessible than butter-based cakes, which need to warm up before slicing for serving.
Read at Tasting Table
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