Preheat your oven to 350°F (175°C). This ensures that your brownies bake evenly.
Grease an 8x8 inch baking pan with a little melted butter or line it with parchment paper for easy removal.
In a mixing bowl, whisk together the melted unsalted butter, pure maple syrup (or brown sugar), and eggs. Add the pure vanilla extract and mix until well combined.
In another bowl, sift together the brown rice flour, unsweetened cocoa powder, baking soda, and instant coffee (or ground cinnamon) to remove any lumps.
Gradually fold the dry ingredients into the wet mixture using a spatula. Combine just until no dry streaks remain.
Gently fold in the dark chocolate chips into the brownie batter. Reserve a handful to sprinkle on top before baking if desired.
Pour the batter into the prepared baking pan, spreading it evenly. Bake for 25-30 minutes, or until a toothpick inserted comes out with a few moist crumbs.
Let the brownies cool in the pan for at least 10 minutes. If you used parchment paper, lift the brownies out for easier cooling. Cut into squares and enjoy!