Preheat the oven to 325 F (165 C).

Put the cupcake papers to the baking tray.

Place the butter into a mixing bowl and microwave until it partially melted.

Add the sugar and vegetable oil to butter and mix until it well combined.

Add the vanilla extract and eggs one by one and continue to mix.

Then add the dry ingredients (flour, cocoa powder, salt, baking powder and chocolate chips) and mix until it combined well.

Put the mixture to each paper and bake for 30 minutes.

After it baked move from the oven and let it cool down for 35 minutes

Place the butter into small saucepan and cook until it melted. Then add the cocoa powder.

Whisk until it is smooth. Remove from the heat and transfer to a medium size mixing bowl.

Let it cool, then add milk, vanilla extract, and powdered sugar.

Mix it until you reached to your desired consistency.

Frost over the cooled brownies and garnish with the mini-M&M’s.