Vegetable Broth (Best Option)
1:1 (1 cup vegetable broth per 1 cup chicken broth)Vegetable broth is a direct flavor and moisture match for chicken broth, providing a similar savory base without animal products. The broth contains minerals and flavor compounds that help maintain the batter's consistency and enhance the waffle's taste.
When using vegetable broth, ensure it is low sodium to control salt levels. Avoid overly strong vegetable broths (e.g., mushroom-heavy) that might alter flavor balance.
The final waffles will have a comparable savory depth and moist crumb, making this the closest substitute in both flavor and texture.