Substitute for Egg Wash

Egg wash is a beaten egg, often loosened with a spoon of water or milk, brushed over dough before baking. The yolk’s fat and the egg’s proteins brown and set into a glossy, slightly stiff skin; the white’s proteins also glue seeds and seal pastry seams. A substitute has to supply one or more of three things: protein and sugar for browning, fat or sugar for shine, and tack for anything that needs to stick. Mississippi State University Extension puts one large egg at about 3 tablespoons, which is why most of the swaps here use that amount.

Pies, scones and pastry

Heavy cream is the standard replacement on pie crusts, galettes and scones. It browns well because it carries both milk protein and lactose, and it gives a soft, even sheen. If the edges of a pie darken before the filling is done, shield them with foil rather than skipping the wash.

For puff pastry, a cream wash browns the top but does not seal layers the way egg does. Keep the wash off the cut edges, or it glues the layers together and stops them rising.

Bread and rolls

Milk suits sandwich loaves and soft rolls, where a matte, tender crust is expected. For seeded rolls and bagels, aquafaba holds seeds best because its proteins and starch dry into a light glue. On enriched sweet buns, soy milk with maple syrup gives the closest thing to an egg’s glossy finish.

Vegan baking

Plant milks vary. Soy milk browns; almond, rice and oat milk stay pale unless sugar is added. Thin layers matter more with sugary washes, since a heavy coat runs into the pan and scorches. If the top is browning too fast, lower the oven by 25°F for the last part of the bake.

When not to substitute

Shiny, deep-brown breads such as challah, brioche and glazed holiday loaves get their look from egg, and no swap reproduces it fully. Laminated dough such as croissants also browns unevenly with milk washes. For these, a yolk-only wash from one egg covers a full loaf or batch if eggs are simply scarce.

When baking for an egg allergy, check that no one has used the same brush for an egg wash earlier.

Common mistakes

• Brushing on too much. Excess liquid runs down the sides, glues dough to the pan and leaves dark streaks.
• Using sweet washes on savory bakes. Maple syrup on a cheese scone tastes out of place and can burn.
• Washing cut edges of puff pastry. The layers stick together and the pastry rises lopsided.
• Using low-protein plant milk alone. Almond milk gives a pale, dull crust that looks underbaked.