From Extreme Brownies: 50 Recipes for the Most Over-the-Top Treats Ever by Connie Weis/Andrews McMeel Publishing, 2014 Found on http://www.crazyforcrust.com
For the Brownies:
2 sticks (1 cup or 8 ounces) unsalted butter
1 1/3 cups 60% cacao bittersweet chocolate chips (I used semi sweet)
4 large eggs
2 cups granulated sugar
1/4 teaspoon salt
1 1/2 teaspoons pure vanilla extract
1/4 cup + 1 tablespoon cake flour
1/4 cup + 2 tablespoons unsweetened cocoa powder
15 Oreo Cookies (or, if you can find them, use the White Fudge Covered Oreos)
For the Fluffy White Frosting:
8 tablespoons vegetable shortening (Crisco)
1/2 stick (1/4 cup or 4 ounces) unsalted butter, softened
1 cup marshmallow creme (such as Fluff)
1 teaspoon pure vanilla extract
1 teaspoon vanilla bean paste (or another 2 teaspoons pure vanilla extract)
1 1/4 cups powdered sugar
About 1 1/4 cups (or more) Oreo Mini Cookies
2 tablespoons unsalted butter
2 tablespoons light corn syrup
1/2 cup semisweet chocolate chips
2 teaspoons very hot water
1.Preheat oven to 350°F. Line a 9x13” pan with foil and grease with butter or spray with cooking spray.
2.Cut the butter into 1-inch slices and place in a small saucepan. Melt over low heat and add the chocolate chips, stirring until the chocolate is melted and smooth. Turn off the burner but leave the pan on it (to stay warm).
3.Whisk the eggs in a large bowl. Add the sugar and salt and whisk until incorporated. Gradually whisk the chocolate mixture into the egg mixture. Whisk in the vanilla.
4.Place the flour and cocoa in sifter or a wire mesh strainer. Sift directly into the batter and stir with a spatula. Pour batter into prepared pan and spread until even. Place the 15 large Oreos evenly on top and press down lightly to cover with the batter.
5.Bake for 28-34 minutes until a toothpick inserted in the center comes out clean. Cool to room temperature on the counter, then cover and let sit overnight (you can also refrigerate it overnight).
6.Make the frosting: beat shortening and butter in a stand mixer with the paddle attached (or a hand mixer). Mix in marshmallow creme and vanilla. Slowly mix in powdered sugar. Spread frosting evenly over top of the brownies. Top evenly with mini Oreos.
7.Make the topping: melt the butter and corn syrup in a small saucepan. Turn off the heat and stir in the chocolate chips, then stir in the water to thin. Drizzle over the top of the frosting. Chill the frosted brownies for at least 1 hour until the frosting and topping sets. Remove from pan and slice into bars.