Making Fudgiest Gluten-Free Brownie Cookies is fun and easy! Just follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper or a silicone mat.
2. Mix Dry Ingredients: In a medium bowl, whisk together the gluten-free flour, baking powder, salt, and cocoa powder until well combined. Set aside.
3. Combine Sugars: In a large bowl, mix the granulated sugar and brown sugar together until there are no lumps.
4. Add Wet Ingredients: Pour in the melted butter, beaten eggs, and vanilla extract into the sugar mixture. Stir until fully combined and smooth.
5. Combine Mixtures: Gradually add the dry mixture into the wet mixture, stirring until mixed. Be careful not to over-mix.
6. Fold in Chocolate Chips: Gently fold in the semi-sweet chocolate chips and, if desired, the chopped nuts for added texture.
7. Scoop the Dough: Use a cookie scoop or spoon to drop rounded tablespoons of dough onto the prepared baking sheet, spacing them a couple of inches apart.
8. Bake: Place in the preheated oven and bake for 12-15 minutes, or until the edges are set and the centers look slightly underbaked.
9. Cool: Remove from the oven and let cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

These steps will guide you to delightful Fudgiest Gluten-Free Brownie Cookies that will wow your taste buds and those of your friends and family.