Melt butter, chocolate with oil. once melted, mix well until blended. let the chocolate mixture cool down
Grease and line a 9x9inch or an 8×8 inch pan, with the parchment paper a little above the edges. Preheat oven at 170º c.
In a medium bowl, mix the flour, cocoa powder, salt, and baking powder. keep aside
In the large bowl, whisk eggs, sugar, vanilla extract together.
add the cooled chocolate mixture to the eggs and mix well using a spatula or a whisk.Combine until the batter is homogeneous.
now add the flour. the batter will be gooey.
Pour the batter in the prepared pan. Bake for 25 to 30 mins. until a toothpick inserted come out with crumbs.
leave the brownies to cool in the pan for completely. before tranfering to a wire rack
let the brownies cool completely before cutting them.