Yes—day-old sourdough works well in roasted garlic and leek bread casserole. Its firm crumb absorbs savory custard without disappearing, while its tangy flavor balances soft, sweet leeks and mellow roasted garlic. The most important adjustments are cutting the bread evenly, drying very fresh bread briefly and adding enough liquid for the bread’s density.
Choose a loaf with a sturdy crumb
Slice the sourdough and cut it into roughly 2-centimeter cubes. A dense loaf may need a little more soaking time; a very open-crumb loaf may absorb custard unevenly. Do not use stale bread that shows mold or off odors.
Ingredients for a small casserole
Use approximately 5 cups loosely packed bread cubes, 2 medium leeks (white and light-green parts), 1 head roasted garlic, 3 large eggs, 1½ cups milk, ½ cup grated cheese if desired, 1 tablespoon butter or oil, black pepper and a modest pinch of salt. Taste the leek mixture before adding extra salt if the cheese is salty.
Prepare the leeks and garlic
Split the leeks lengthwise and rinse thoroughly between their layers to remove trapped sand. Slice thinly and cook gently in butter until softened, not browned. Roast garlic separately until the cloves can be squeezed into a soft paste. Mash the paste through the cooked leeks for even distribution.
Assemble and bake
Heat the oven to 350°F (177°C). Lightly grease a roughly 8-inch square baking dish. Spread the bread cubes and leek-garlic mixture in the dish. Whisk eggs with milk, pepper and cheese, pour over the bread, and press gently so cubes absorb the liquid. Rest about 15–20 minutes, then bake for approximately 35–45 minutes, depending on the dish depth, until the center is set and reaches 165°F (74°C) on a food thermometer. Baking times are guides, not safety checks.
How to keep the top crisp
For more contrast, leave a few bread-cube corners exposed above the custard and avoid overfilling the pan. If the top browns too quickly before the center is done, cover loosely with foil until cooked through.
FAQ: Can I make it the night before?
Yes. Cover and refrigerate promptly after assembly, and bake the next day while ensuring the center reaches 165°F. Keep perishable ingredients at 40°F (4°C) or below; do not leave the assembled egg-and-milk mixture sitting out for hours.
FAQ: Should the bread be toasted first?
Fresh, very soft bread benefits from a brief dry toast. Firm day-old sourdough often does not need it.
More
See how to tell when garlic-leek bread casserole is done and the USDA safe minimum temperature chart.
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