If you ask any bakery how they measure, most will say they measure in grams. Measuring by weight is more reliable for desserts because some recipes don’t specify if you should pack your ingredients and do not take into account how different people measure their ingredients.
A common mistake people make in measuring ingredients is when measuring brown sugar. Brown sugar is clumpier than normal sugar because it is mixed with molasses. 100 grams of white sugar is equivalent to 100 grams of packed brown sugar—though most people don’t pack their brown sugar the same way, so you will most likely not get the same measurement unless using a scale.
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Mix together your butter (melted), granulated sugar, and brown sugar.
Step 2
Add in vanilla extract and eggs and whip until mixture goes from yellow to off-white. (This gives brownies the crackly top ;)
Step 3
Mix in vegetable oil until fully incorporated.
Step 4
Mix in dry ingredients—cocoa powder, All-purpose flour, cornstarch, and baking soda—until mixture is partially smooth.
Step 5
Pour brownie batter into greased and parchment paper lined square pan.
Bake at 350 for 21-23 minutes.
Step 6
Let brownies cool while you make frosting.
Step 7
Hot Cocoa Frosting: Whip butter for 3-4 minutes on high speed. Add powdered sugar and hot cocoa mix until smooth and thick. Add in heavy cream and whip on high speed for 2 minutes. Lastly, mix in vanilla.
Spread across chilled brownies and then sprinkle mini marshmallows on top.
Step 8
Let cool for 20-30 minutes and cut with a knife.
Eat fresh or store in the fridge for up to 10 days!