Melted Butter (Best Option)
1:1 (1 cup melted butter per 1 cup vegetable oil)Butter works well because it contains about 80% fat and 15-20% water, which mimics the moisture and fat balance of vegetable oil. The fat coats flour proteins, limiting gluten formation, which is essential for tender biscuits. Butter's water content also creates steam during baking, contributing to flakiness.
To use butter effectively, melt it gently and cool slightly before mixing to avoid prematurely activating leavening agents. Be mindful that butter solidifies at room temperature, so dough handling should be quick to maintain texture.
Compared to vegetable oil, butter imparts a richer flavor and slightly more tender, flaky texture. The biscuits may brown more due to milk solids in butter, enhancing appearance and taste.