Brownie recipe that can be made in 30 minutes.

Preheat the oven to 180°C. Grease a 20cm square baking tin or line it with parchment paper.
If using semi-sweet chocolate, melt it together with the butter in a double boiler or in the microwave, stirring every 30 seconds to prevent burning. Let it cool slightly.
In a bowl, beat together the eggs, sugar, and vanilla extract until smooth. Add the chocolate and butter mixture, mixing well.
Sift the flour and salt over the liquid mixture and stir until just combined. Avoid overmixing. If desired, fold in the chopped walnuts.
Pour the batter into the prepared pan and smooth the surface with a spatula. Bake for about 20 to 25 minutes, or until a toothpick inserted into the center comes out with a little batter on it, but not completely clean.
Let the brownie cool in the pan for a few minutes before cutting into squares. Serve while still warm or at room temperature.
This brownie is the perfect choice when you want a delicious and quick dessert. In just 30 minutes, you can have rich and moist brownies ready to enjoy.