Preheat Oven and Prepare Baking Sheet:

Preheat your oven to 325°F (165°C). Line a 12x17 inch baking sheet with parchment paper or a silicone baking mat.

Mix Wet Ingredients:

In a large mixing bowl, combine the melted butter and granulated sugar. Mix until the sugar is dissolved and the mixture is smooth.

Add Eggs and Vanilla:

Add the eggs and vanilla extract to the butter-sugar mixture. Mix well until fully incorporated.

Sift Dry Ingredients:

In a separate bowl, sift together the all-purpose flour, unsweetened cocoa powder, and salt.

Combine Wet and Dry Ingredients:

Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix.

Spread Batter onto Baking Sheet:

Pour the batter onto the prepared baking sheet. Use a spatula to spread it out evenly, covering the entire surface of the baking sheet. Ensure the batter is spread thinly for a crispy result.

Optional: Add Toppings:

If desired, sprinkle chopped nuts or chocolate chips evenly over the batter.

Bake:

Place the baking sheet in the preheated oven and bake for about 20-25 minutes, or until the edges are crispy and the center is set.

Cool and Break:

Remove the brownie brittle from the oven and allow it to cool completely on the baking sheet. Once cooled, break the brittle into smaller pieces using your hands or a knife.

Serve and Store:

Serve the brownie brittle as a delicious snack or dessert. Store any leftovers in an airtight container at room temperature for up to several days.