Mayonnaise is oil and egg yolk already evenly dispersed. That structure allows fat to coat flour proteins efficiently from the start, limiting gluten development and producing a finer, more cohesive crumb. It doesn’t make the cornbread richer in flavor; it makes it more defined in texture—soft but not cakey, sturdy but not dry. Buttermilk activates the baking soda, baking powder ensures steady lift, and the hot cast-iron skillet sets the outer starches immediately, creating the golden-brown crust that defines great cornbread. The mayonnaise disappears into structure. What remains is cornbread at its best—crisp-edged, tender-centered, and improved by an ingredient designed to bind fat and water seamlessly.
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