Place a 10" cast iron skillet in oven. Preheat to 420.: The air in your oven should feel dry and the heat aggressive enough to create a blistering contact with the batter. When the skillet is hot you will often hear a faint sizzle if any residual moisture remains, and the metal will radiate heat when you open the oven door. This very high preseasoning of the pan is what yields the deep brown, slightly crunchy edges that define great skillet cornbread. Avoid the mistake of skipping this step, because adding batter to a cool pan will prevent crust formation and make the loaf dense. If you use a thinner pan instead of cast iron the crust will be less pronounced, so cast iron is preferred for that smoky caramelization.
While oven and pan is warming, prepare batter.: Work quickly but methodically as you assemble the batter so that the skillet stays piping hot. You should feel slightly rushed, yet controlled, as ingredients come together. A well prepared batter has a smooth sheen and pourable consistency. One common error is letting the batter sit too long after adding the leavening, which can reduce rise, so mix and move efficiently to maintain lift.
In a mixing bowl combine cornmeal and milk.: When you stir the cornmeal into the milk , you will see the grain absorb liquid and plump up, forming a thick, rustic paste. The texture shifts from powdery to slightly textured, and a faint sweet corn aroma becomes apparent. This rest hydrates the cornmeal , preventing a gritty center. Skipping this step can result in dry pockets of cornmeal , so give it time to soften for a cohesive crumb.
Let set for 10 minutes.: During this pause the cornmeal swells and mellows, and you will notice the batter becoming more homogeneous. This resting period allows starches to absorb moisture which helps the crumb set properly while baking. A typical pitfall is under resting, which leaves the interior dry; over resting longer than 20 minutes is usually harmless but can slightly thicken the batter and change baking time, so stick close to the suggested window.
In a separate bowl, add flour, sugar, baking powder and salt and mix well.: As you whisk these dry elements, the mixture should look evenly pale and free of lumps, with the sugar grains dispersed. This distribution ensures the baking powder is evenly spread, which is key for uniform rise. If the baking powder clusters you might get uneven pockets of lift, so break up any clumps and whisk thoroughly. Measuring errors, especially for the baking powder , can cause under rise or a metallic taste, so level your teaspoons carefully.
Pour into cornmeal mixture and mix well. Stir in eggs and melted butter and mix until smooth.: At this stage the bowl takes on a warm, glossy sheen, and the batter should flow slowly from the spoon, thick but pourable. As you fold in the eggs and melted butter , you will see tiny bubbles appear, promising lift in the oven. The aroma will deepen, with buttery notes blooming. Over mixing after the flour is added can develop gluten and yield toughness, so combine until just smooth. If your batter seems too stiff add a splash more milk , but be cautious because thinning it too much will flatten the loaf.
Pour into preheated pan and bake for 18-20 minutes or until toothpick inserted in center comes out clean.: When you pour the batter into the screaming hot skillet you should hear an immediate light hiss, a sign that the exterior is beginning to crisp. The oven will coax the top to a light golden brown while the base forms a deeper crust. Look for a deeply bronzed edge and a center that springs back slightly. A clean toothpick indicates doneness, but if it comes out with wet batter return to the oven in two minute increments. A common mistake is opening the oven too often, which cools the environment and lengthens baking time, so check sparingly.
Cut into slices before serving.: After a brief rest of a couple of minutes so the crumb firms slightly, run a knife through the loaf and portion into wedges. The sound should be a soft, confident cut, and the interior will reveal a warm, tender texture flecked with the cornmeal grain. Serving too hot can cause the crumb to fall apart when cut, while waiting too long cools the crust. Aim to serve warm for the best mouthfeel, and avoid using a serrated saw motion which can tear the crumb, instead use a steady downward pressure.
Serves 8-10.: This guideline helps plan portions; the wedges will be generous and ideal for sharing. If you need larger slices for a heartier meal, plan accordingly. Undersizing portions can leave guests wanting more, while oversized wedges may overwhelm a lighter entrée. Keep this serving suggestion in mind when pairing and timing the rest of your meal.