Preheat your oven to 350º F. Line your baking pan with parchment paper. Grease the paper and the sides of the baking pan.
In a mixing bowl, beat sugar and eggs together until it's slightly thickened. Then, add the flour, milk, oil, vanilla and baking powder until the batter is smooth and creamy.
Pour batter in the baking pan and let bake in the oven for 30 - 40 minutes.
When the top of the cake becomes golden, take a toothpick and poke it in the center. If it comes out clean, take it out of the oven and let it cool down before putting frosting or taking it out of the pan.