* 1/3 cup superfine rice flour, plus extra for dusting baking pan * 1/3 cup amaranth flour (I usually just grind amaranth seeds in my coffee grinder or Vitamix) * 1/4 cup sorghum flour * 1/4 cup potato starch * 1/4 cup sugar * 1-1/4 teaspoons xanthan gum * 1/8 teaspoon cinnamon * 2 Tablespoons honey * 6 Tablespoons cold butter, cut into small pieces * 2-1/2 cups high quality chocolate chips * 2 cups mini marshmallows (girlcooksworld.com)
I made note of this before in my top tips for gluten - free baking post, but it's absolutely essential to use superfine rice flour for all your gluten - free baking. (girlcooksworld.com)
It sounds like your texture issue is due to your flour blend, which was likely not properly balanced and not made with superfine rice flour. (glutenfreeonashoestring.com)