Egg is the top-ranked Flaxseed substitute for Brownies, chosen for how well it preserves Brownies's structure, moisture, and flavor. 1 options are ranked on this page by Brownies-specific applicability.
Flaxseed plays a specific role in Brownies — structure, rise, moisture, or flavor — and substitutes that miss the role relevant to Brownies rank lower here than they might elsewhere. The list above is tuned to Brownies, not to generic baking or cooking.
Start with the listed ratio but watch for Brownies-specific warnings below each card — some subs need a moisture tweak, heat adjustment, or companion ingredient to work in Brownies. Taste a small batch before committing.