Extreme Chocolate Cookies - cooking recipe

Ingredients

1 1/2 cups all-purpose flour
1/2 cup unsweetened baking cocoa (sifted)
3/4 teaspoon baking soda
1/2 teaspoon salt
1/2 cup butter, room temperature
1/2 cup stick margarine, room temperature (do not use the soft tub margarine)
1 cup white sugar
1/3 cup light brown sugar
1 large egg
1 egg yolk (save the white for another use!)
2 teaspoons vanilla
1 (10 ounce) package semi-sweet chocolate chips (or use white chocolate chips or both!)

Preparation

In a medium bowl mix together flour, cocoa powder, baking soda and salt until well combined.
In another large bowl using an electric mixer, beat the butter, margarine, white sugar, brown sugar and vanilla until fluffy (about 3 minutes).
Add in the egg and egg yolk; beat for about 5-6 minutes (no sugar granules should remain in the batter!).
Add in the flour mixture and mix JUST until completely combined with the electric mixer (batter will be thick).
Cover and chill the batter for about 5 hours (or overnight).
Set oven to 350\u00b0F.
Lightly grease a large baking pan.
Drop about 2 heaping tablespoons cookie dough onto a baking sheet (if using a 15 x 10-inch baking sheet you should get 8 cookies on the sheet, two across and four rows).
Bake for about 8 minutes or until the cookies are just set and begin to crack on top.
Cool the cookies in the baking pan then transfer to a rack (the cookies will firm up while sitting).