INGREDIENTS
2 1/4 cups
All purpose flour
1/3 cup
Cocoa powder, unsweetened
1/3 cup
Cocoa powder
2 2/3 cups
Powdered sugar
1/4 tsp
Salt
2 cups
Semisweet or bittersweet chocolate chips
1 tsp
Vanilla extract
1 1/4 cups
Butter
1/4 cup
Sour cream or plain yogurt