Mississippi Mud Brownies

Mississippi Mud Brownies
I make these every weekend for my little Sunday School kids and they are perfect every time!
Ingredients
For the brownies:

• 2 teaspoons vanilla extract
• 1/2 cup oil (vegetable or canola oil)
• 1/2 cup butter , softened
• 2 cups granulated sugar
• 4 large eggs
• 1 teaspoon salt
• 1/3 cup unsweetened cocoa powder
• 3 cups mini marshmallows
• 1 1/2 cups all-purpose flour

For the frosting:

• 1/3 cup evaporated milk
• 1/2 cup melted butter
• 1 teaspoon vanilla extract
• 3 - 3 1/2 cups powdered sugar
• 1/3 cup unsweetened cocoa powder

Source :tastesbetterfromscratch