Gluten-Free Brownie Cookies made from almost the same batter?

Adapted for gluten-free from King Arthur Flour’s recipe for Fudge Brownies
Makes 10 large cookies
Cocoa/Egg mixture
1 large eggs
1/2 cup + 2 tablespoons cocoa powder
1/2 teaspoon salt
1/2 teaspoon baking powder
1/2 teaspoon instant espresso powder
Flour Mixture (Dry Ingredients)
1/2 cup + 2 tablespoons Cup4Cup Multipurpose Flour (original blend)
2 Tablespoons blanched almond flour
1 teaspoon sweet rice flour
1/4 teaspoon xanthan gum
1/2 cup semi-sweet mini chocolate chips
Butter Mixture
7 tablespoons butter
1 cup + 2 tablespoons light brown sugar
Preheat the oven to 350°F and set the rack in the middle position.
In a medium-sized bowl, whisk together the dry ingredients except for the chocolate chips and set aside. In a large bowl, mix together the cocoa/egg mixture and set aside. This will be a thick, shiny chocolate fudge-like texture. Microwave the butter and granulated sugar together, stirring every 30 seconds until the sugar dissolves a bit and the mixture begins to be a bit less grainy. Do not bring it to a boil. Add the butter mixture to the cocoa/egg mixture and stir until completely combined. Add dry ingredients and mix well until no dry bits remain. Scrape the bowl as needed. Stir in the chocolate chips. Scoop the cookies into 2 tablespoon-sized balls and chill completely. Bake on a parchment-lined cookie sheet for about 10-12 minutes. Cookies are done when set on the sides, but puffed and soft in the center.