Want A Moister Cake? Don't Just Use Butter - Tasting Table
Briefly

Butter is a primary fat in baking, prized for its rich flavor, but oil serves an important role in cake-making. Oil contributes 100% fat, leading to moister cakes as it retains moisture better than butter, which contains water. Cakes incorporating oil maintain softness longer because oil remains liquid. Strongly flavored cakes benefit from oil as it allows these flavors to stand out whereas simpler cakes thrive on the buttery richness. Adjusting cake recipes to include oil can enhance both texture and flavor profiles.
Using a mix of both butter and oil in cake recipes creates a super moist cake. Oil provides 100% fat, ensuring more moisture and softness in baked goods.
Unsaturated oils, like vegetable or canola oil, produce a cake that feels more moist compared to butter, which is saturated fat. This contributes to a denser crumb.
Cakes made with oil remain soft and moist longer than those made with only butter, since oil's fat content does not solidify over time like butter's does.
Recipes with strong flavors like red velvet or chocolate mocha cakes benefit from oil, allowing flavors to shine, while plain cakes require the richness of butter.
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