Preheat your oven to 350 degrees Fahrenheit.
Melt 1 cup of chocolate chips in a microwave-safe bowl using 30-45 second intervals, stirring after each interval until smooth.
In a separate bowl, whisk together eggs, sugar, vanilla, milk, and oil until well combined. Stir in the melted chocolate.
Mix in the gluten free flour, cocoa powder, salt, and baking powder until a batter forms. Gently fold in the remaining 2/3 cup of chocolate chips.
Pour the batter into an 8x8 inch baking dish lined with parchment paper, smoothing it into an even layer.
Bake in the preheated oven for 30-38 minutes, or until a toothpick inserted into the center comes out mostly clean with a few moist crumbs attached.
Allow the brownies to cool completely in the pan on a wire rack. For cleaner cuts, chill the brownies in the refrigerator for about 20 minutes before slicing into 16 squares.