Prep Time 20 minutes mins
Cook Time 30 minutes mins
Total Time 50 minutes mins
For best results, use day-old or slightly stale sourdough so it can soak up the custard without becoming mushy, and adjust soaking time based on how dense your loaf is—thicker, chewier sourdough may need a few extra seconds per side. Keep the heat at medium to medium-low to avoid burning the exterior before the center sets, and wipe the pan between batches if butter solids start to brown too quickly. You can customize the flavor by adding orange zest, a splash of bourbon or rum, or swapping some milk for half-and-half, and keep finished slices in a low oven (about 90–100°C / 200°F) for up to 20 minutes so everything stays warm and crisp for serving.