Preheat & Line Tin: Set your oven to 356ºF (180ºC) fan-forced. Line a 20cm square baking tin with parchment paper and set aside.
Combine Ingredients: In a large mixing bowl, add the brownie mix. Pour in the lightly whisked eggs, oil, and mint extract.
Mix: Stir the mixture until just combined, ensuring there are no dry pockets but avoid overmixing.
Spoon into Tin: Transfer the batter into the lined tin and smooth out the top evenly.
Bake: Place in the oven and bake for 18-20 minutes. Look for a crinkly crust on top and a toothpick with a few moist crumbs when inserted in the center. Be careful not to overbake to retain a fudgy texture.
Cool in Tin: Remove from the oven and let the brownies cool in the tin for 10 minutes.
Transfer to Rack: Move them to a wire rack to cool completely.
Slice & Serve: Cut the brownies into squares and enjoy!
Notes
Store: Keep the mint brownies in an airtight container at room temperature for up to 3-4 days.
Freeze: Wrap the brownies tightly and freeze them in a freezer-safe container for up to 3 months.
Thaw: To thaw, leave the brownies at room temperature for a few hours before serving.