Ingredients
2  3-ounce packages cream cheese, softened
1/3  cup butter or margarine
1/4  cup shortening
1/2  cup packed brown sugar
1   egg
1/2  teaspoon vanilla
1-1/2  cups all-purpose flour
1/2  teaspoon baking soda
1  cup coarsely chopped semisweet chocolate
2-1/3  cup sifted powdered sugar
1/4  cup unsweetened cocoa powder
1/4  cup softened butter or margarine
2  tablespoons boiling water
1/2  teaspoon vanilla
1/4  cup chopped lightly salted mixed nuts or peanuts
 
Directions
1. In a medium mixing bowl beat cream cheese, 1/3 cup butter or margarine, and shortening with an electric mixer on medium to high speed for 30 seconds. Add brown sugar, egg, and 1/2 teaspoon vanilla. Beat until thoroughly combined. Beat in flour and baking soda on low speed just until combined. Stir in the chopped chocolate. 

2. Spread cookie dough evenly in a greased 12- or 13-inch pizza pan. Bake in a 350 degree F oven for 20 to 22 minutes or until lightly browned around the edges. 

3. Meanwhile, for the fudgy frosting, in a small mixing bowl combine powdered sugar, unsweetened cocoa powder, 1/4 cup softened butter or margarine, boiling water, and 1/2 teaspoon vanilla. Beat with an electric mixer on low to medium speed until combined. Beat on medium speed about 1 minute or until fluffy. 

4. Frost with Fudgy Frosting. Sprinkle with chopped nuts. Cut into wedges. Makes 12 servings.  

Source:  Better Homes & Gardens