For Even Fudgier Brownies, Make A Gluten-Free Ingredient Swap - Tasting Table
Briefly

Gluten-free baked goods often get a bad rap for being overly dense or spongey, but with the right flour, these brownies achieve a wonderfully fudgy texture.
Using gluten-free measure-for-measure flour allows for a simple one-to-one substitution in brownie recipes, making it easy to enjoy gluten-free treats without sacrificing flavor.
To achieve the desired fudgy consistency in gluten-free brownies, ensure that granulated sugar completely dissolves in the butter to avoid a gritty texture.
The higher absorbency of gluten-free flours results in denser brownies, as they soak up melted butter, enhancing the overall moisture content.
Read at Tasting Table
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