I customized this recipe from my dad.
Controlling pan temperature determines whether bread browns evenly or burns before the interior sets. Maintain medium heat so the butter melts without smoking while the egg proteins coagulate slowly. A shallow skillet with a wide base provides ample room for two slices of bread without overcrowding. Cast iron or heavy stainless steel pans retain heat efficiently across the entire cooking surface. Whisking eggs, milk, and vanilla thoroughly in a wide, shallow bowl prevents pockets of unblended white from clinging to the bread surface.
Choose a skillet that allows at least one inch of clearance around each slice of bread. Proper spacing ensures a spatula can slide underneath easily during the flip without tearing softened slices. Thin aluminum pans create hot spots that scorch dairy solids in the butter before the center cooks. Using a moderate heat setting keeps butter fats stable throughout the process.