1. Preheat your oven to 350°F (175°C). Line an 8×8 inch baking pan with parchment paper, leaving an overhang on the sides to easily lift the brownies out later.
2. In a large mixing bowl, whisk together the protein powder, unsweetened cocoa powder, almond flour, and leavening agent. Ensure there are no lumps.
3. In a separate medium bowl, whisk together the melted coconut oil, liquid (milk or water), eggs, flavoring essence, and a pinch of salt.
4. Gradually add the wet mixture to the dry components. Stir until just combined. Be careful not to overmix the batter, as this can lead to a cake-like texture.
5. Pour the batter evenly into the prepared baking pan. If desired, sprinkle chocolate chips over the top.
6. Bake for 18-25 minutes. A toothpick inserted into the center should come out with moist crumbs, not completely clean. This indicates a fudgy texture.
7. Let the brownies cool completely in the pan on a wire rack before cutting into squares. This allows them to set properly and enhances their fudgy consistency.
8. Store cooled brownies in an airtight container at room temperature for up to 3 days, or refrigerate for up to 1 week. For longer storage, wrap individual brownies and freeze for up to 3 months.