01 -
Set the oven rack in the middle position. Preheat the oven to 180 °C. Stir together all the ingredients in a small pot and bring them to a boil, whisking. Let it simmer on medium heat for 5 minutes, then take it off the heat.
02 -
Mix the flour, baking powder, and salt together in one bowl. In another bowl, beat the sugar, oil, vanilla, and egg using an electric mixer. Add the dry ingredients gradually, alternating with the milk, on low speed. Pour the batter evenly into a square baking pan (20 cm). Carefully drizzle the topping over the batter.
03 -
Bake for 25 minutes or until a toothpick slid into the center comes out clean. Let it cool down slightly on a wire rack before serving.