2 1/2 cups all-purpose flour
1/2 tsp baking soda
1/2 tsp salt
1 cup shortening
1 cup packed light brown sugar
1/2 cup granulated sugar
2 large eggs
2 teaspoons vanilla
1 bag semi sweet regular or miniature size chocolate chips (2 cups)
Preheat oven to 300° F. Line a large (13 inch) round pizza pan with a circle of parchment or non-stick foil or spray well with cooking spray.
Mix flour, baking soda and salt together; set aside.
Cream shortening and both sugars by hand or with an electric mixer. Beat in the eggs and vanilla.
When well mixed, add flour mixture and stir until blended Fold in chocolate chips.
Put all the dough in the pan and press it down until it reaches the rim and is flat.
Bake on center rack for 35 - 40 minutes or until cookie is golden around edges and appears set.
Cool in the pan for 10 minutes then gently slide it off to a wire rack.
For the frosting here is what I did:
4 cups confectioners sugar
1/4 cup butter
1/4 cup shortening
5 tbsp. milk
1 tsp. vanilla extract
Gel food coloring
Combine all ingredients except food coloring in the bowl of a stand mixer. Beat on medium-high speed until smooth and stiff, 4-5 minutes. Stir in food coloring and pipe onto cake.