The short answer is yes, you can absolutely make this swap, but it fundamentally alters the texture and flavor profile of the final product. A standard rule of thumb is to use three-quarters of the amount of oil as the amount of butter.
Oil Versus Butter Brownie Test: Texture, Ratios, and Results
Additionally, because the moisture content is lower, these brownies often benefit from a simple syrup brushed on top while still warm, or an extra egg yolk added to the batter to enhance richness and retain moisture without adding more fat. It is also a fantastic option for those who are lactose intolerant or vegan, as it allows for a dairy-free treat without sacrificing the moist texture.
It also contains milk solids that contribute to flavor and browning. Practical Substitution Ratios Converting a recipe from butter to oil is not a 1:1 measurement by volume due to the density difference.
Oil Versus Butter Brownie Test: Texture and Ratio Tips
You might find that oil brownies spread a bit more in the pan or require a minute or two less baking time. This adjustment helps prevent the batter from becoming too greasy or wet.
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