Preheat your oven to 175° C | 350° F before moving to the nextstep.
Another must-to-do thing is greasing your 8-inch square baking pan using a cooking oil spray, and then line with parchment paper.
Use a medium-sized bowl to whisk well the melted butter, sugar ,oil for about a minute. Add vanilla and eggs and beat all together for another minute until you get lighter in color mixture.
Sift in the dry ingredients you have; the flour, cocoa powder as well as salt before folding them gently into the mixture you made. When the dry ingredients are well-combined with the wet ingredients stop beating because over-beating will incorporate too much air into your brownies hence changes their texture.
Pour the batter into the already greased baking pan. Then immediately smooth the top. You can top it chocolate chips or chocolate chunks if you like that.
Bake in preheated oven for 20 to 25 minutes. You can know that the brownies are baked when their center doesn’t jiggle knowing that the brownies will continue to bake out of the oven in the hot pan.
When you remove the baking pan from the oven let the brownies cool in the pan for a few minutes before slicing into brownies.