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Export 10 ingredients for grocery delivery
Step 1
Preheat oven to 350 degrees F. Grease a 9x13'' pan with non-stick cooking spray.
Step 2
In a large mixing bowl, pour oil over cocoa powder and mix.
Step 3
Add softened butter and mix until smooth. Add sugar and mix for 1 minute. Add eggs, one at a time, mixing after each addition. Add vanilla and mix.
Step 4
Add flour and salt and stir to combine.
Step 5
Pour batter into prepared pan. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Step 6
Remove brownies from the oven and sprinkle the marshmallows evenly on top. Return to the oven for 2-3 minutes or until the marshmallows are puffed. Remove from oven and allow them to cool completely.
Step 7
Once brownies are cool, make the frosting.
Step 8
Add melted butter, cocoa powdered, evaporated milk, vanilla, and 2 cups of powdered sugar to a mixing bowl and beat with electric beaters until smooth.
Step 9
Add more powdered sugar, a cup at a time, mixing well, until you reach your desired frosting consistency. I usually use about 3 1/4 cups powdered sugar.
Step 10
Spread frosting over the cooled brownies and cut into squares. I've found a plastic knife works best to cut them, or if you make them 1 day in advance they are much easier to cut.