Preheat your oven to 350°F (175°C).
In a medium bowl, whisk together the flour, cocoa powder, and salt.
In a large mixing bowl, beat together the melted butter, sugar, and vanilla extract until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Stir in the chocolate chips and any optional ingredients, such as nuts or coconut flakes.
Line a baking sheet with parchment paper or a silicone baking mat.
Pour the brownie mixture onto the prepared baking sheet and spread it out evenly with a spatula.
Bake for 12-15 minutes, or until the edges are crispy and the center is just set.
Remove the brownie brittle from the oven and let it cool completely on the baking sheet.
Once cooled, break the brownie brittle into small pieces using a sharp knife or your hands.