Frosted Cookie Brownies

This came to me online from ToH and boy does it sound good, I searched and there 2 other recipes with similar names. But not the same thing. With a crisp cookie crust and a fluffy frosting, These brownies are the best.

• Ready In: 1 hr 10 mins
• Serves: 15
• Yields: 1 Cake pan

Ingredients

• 1 (18 ounce) package  refrigerated chocolate chip cookie dough
• 3  cups miniature marshmallows
• 2  cups  semi-sweet chocolate chips
• 1  cup butter, cubed
• 4  eggs
• 2  teaspoons vanilla extract
• 1  cup all-purpose flour
• 1⁄2 teaspoon baking powder
• 1⁄4 teaspoon salt
• 1  cup  chopped walnuts

• FROSTING

• 2  cups miniature marshmallows
• 6  tablespoons milk
• 1⁄4 cup butter, softened
• 2  ounces  unsweetened chocolate
• 3  cups confectioners' sugar

Directions

1. Press cookie dough into a greased 13-in. x 9-in. baking pan.
2. Bake at 350° for 10 minutes.
3. Meanwhile, in a large saucepan, combine the marshmallows, chips and butter; cook and stir over low heat until melted and smooth.
4. Transfer to a large bowl; cool. Beat in eggs and vanilla.
5. Combine the flour, baking powder and salt; gradually stir into marshmallow mixture. Stir in nuts.
6. Spread over cookie crust.
7. Bake for 30-35 minutes or until a toothpick inserted near the center comes out clean.
8. Cool on a wire rack.
9. For Frosting:
10. In a small saucepan, combine the marshmallows, milk, butter and chocolate.
11. Cook and stir over low heat until smooth.
12. Remove from the heat; beat in confectioners' sugar until smooth.
13. Frost brownies. Cut into bars.