Thick and Chewy Double-chocolate Cookies

2 Cups flour
1/2 Cup cocoa powder
2 tsp baking powder
1/2 tsp salt
16 ounces semisweet chocolate chopped
4 large eggs
2 tsp vanilla
10 TBS (1 1/4 sticks) unsalted butter softened
1 1/2 cups packed light brown sugar
1/2 cup granulated sugar

Sift flour, cocoa, baking powder and salt in medium bowl, set aside.
Melt chocolate (double boiler or microwave) . Beat eggs and vanilla lightly in another bowl and set aside.
In mixer beat butter at medium speed until smooth and creamy. Beat in sugars until combined about 45 seconds. Mixture will look granular. Reduce speed to low and gradually beat in egg mixture. Add chocolate in steady stream and beat until combined. Add dry ingredients and mix until just combined. Cover with plastic wrap and let stand at room temperature until consistency is scoopable and fudgelike, aboaut 30 minutes. Bake at 350 for 10 minutes. (Can be made into Thick and Chewy Triple-Chocolate Cookies by adding chocolate chips).