Preheat the oven to 350°F (175°C). Grease an 8 x 8-inch baking dish on the bottom and sides and set aside.
In a large mixing bowl, whisk together the almond flour, chocolate protein powder (or the 1/2 cup protein + 1/4 cup collagen), erythritol (or sugar), cocoa powder, baking powder, and salt until evenly combined.
Add the melted butter (or coconut oil), eggs, and vanilla extract to the dry ingredients and stir until a thick, uniform batter forms.
Fold 3/4 cup of the chocolate chips into the batter, reserving the rest for topping.
Press the dense batter evenly into the prepared baking dish and sprinkle the remaining chocolate chips over the top.
Bake for 25 to 30 minutes, or until the center is set and slightly puffy. Avoid overbaking for a fudgy texture.
Allow the brownies to cool in the pan for at least 15 minutes before cutting into 12 large or 16 smaller pieces.