Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan with oil or non-stick spray.

In a large mixing bowl, whisk together gluten-free all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, and salt.

In a separate bowl, beat together the eggs, vegetable oil, milk, and vanilla extract until well combined and frothy.

Gradually pour the wet ingredients into the dry mixture and mix until you achieve a smooth batter.

Pour the batter into the prepared cake pan and spread it evenly with a spatula.

Bake in the preheated oven for approximately 30 minutes or until a toothpick comes out clean.

Let the cake cool in the pan for about 10 minutes before transferring to a wire rack to cool completely.