Start by preheating your oven to 180°C (350°F). This ensures that your brownies bake evenly and come out with that perfect fudgy texture. Grease and line a baking tray with parchment paper to make it easy to remove your brownies once they're done.

In a heatproof bowl, combine the butter and white chocolate. You can use a microwave or a double boiler to melt them. If you're using the microwave, heat them in 20-second intervals, stirring in between, until the mixture is smooth and fully melted.

Once your butter and white chocolate are melted and combined, add the white sugar, and vanilla extract to the bowl. Stir well until the sugar is fully incorporated and the mixture is smooth.

Crack the eggs into the mixture one at a time, stirring well after each addition. The eggs will help bind all the ingredients together and give your brownies that classic fudgy texture. Check that the mixture achieves a silky and glossy consistency.

Now, add the plain flour and salt. Gently fold the dry ingredients into the wet ingredients using a spatula or spoon. Stir only until the ingredients are incorporated; overmixing can result in dense, tough brownies.

Pour the batter into your prepared baking tray and spread it out evenly. Bake the brownies for 20-25 minutes or until a toothpick inserted into the center comes out with just a few moist crumbs (not wet batter). This ensures you get that perfect fudgy center.

After baking, let the brownies rest in the pan for 10 minutes before moving them to a wire rack to cool fully. Once cooled, slice into squares and savor the treat!