Tamari (Best Option)
1 teaspoon per 1 tablespoon soy sauceTamari is a Japanese soy sauce variant that is typically brewed with little to no wheat, making it gluten-free and less salty than regular soy sauce. It preserves the umami flavor that enhances the chocolate depth in brownies without adding bitterness or overpowering saltiness.
When substituting, use slightly less tamari than soy sauce to avoid excess saltiness. Stir well to ensure even distribution, as tamari is slightly thicker.
The final brownies will retain a rich, complex flavor with subtle savory undertones that complement the chocolate, closely mimicking the original soy sauce effect.