Preheat your oven to 350 degrees Fahrenheit (180 degrees Celsius). Grease and flour a 9-inch (23 cm) cake pan.

In a large mixing bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt.

Add the melted butter, beaten eggs, and vanilla extract to the dry ingredients. Mix until well combined.

Gradually add the milk to the batter, stirring until it is smooth and well-mixed.

Pour the batter into the prepared cake pan and smooth the top with a spatula.

Bake the cake for 30-35 minutes, or until a toothpick inserted into the center of the cake comes out clean.

Remove the cake from the oven and let it cool in the pan for 10 minutes. Then, carefully invert the cake onto a wire rack and let it cool completely.

Once the cake is cool, you can serve it as is or add your favorite toppings. Some popular choices include whipped cream, vanilla ice cream, or a drizzle of chocolate ganache.