Preheat the oven to 325℉, grease and line a 9X13-inch pan, set aside.
Melt the butter, add the oil, and then add the cocoa powder. Oil should warm up slightly to absorb the cocoa powder better. Mix all together and let the cocoa powder bloom.
⅔ cup Oil, ¼ cup Butter, ⅔ cup Cocoa powder
Whisk sugars with eggs and vanilla extract using the whisk attachment or hand mixture. Take your time with this step, as this step contributes to a shiny and crackle top. Whisk for 3- 4 minutes. until the mixture is smooth and light in colour.
3 Eggs, 1⅓ cups Powdered sugar, ⅔ cup Brown sugar, 1 tablespoon Vanilla extract
Add half of the oil and cocoa powder mixture and whisk for 3-4 minutes. This will give your brownie a shiny and cracked top.
Sift all-purpose flour and salt in a separate bowl and add to the egg mixture. Gently fold the dry ingredients and scrape the bottom of the bowl to ensure all the ingredients are well incorporated. Add the remaining of the oil mixture and mix well.
½ cup+1tbsp All-purpose flour, ½ teaspoon Salt
Mix the chocolate chips and pour the batter into the lined and greased pan. Smooth the top with a spatula. Bake the brownies for 30-35 minutes. Do not overbake the brownies, which will result in dry brownies.
1 cup Chocolate chips
Let the brownies cool down before spreading the ganache.