Good-Cooking - Death By Chocolate Cookies

Ingredients

• 2 (12 ounce) packages semisweet baking chocolate, divided
• 3/4 cup firmly packed light brown sugar
• 1/4 cup butter, softened
• 2 eggs, lightly beaten
• 1 teaspoon vanilla extract
• 1/2 cup all-purpose flour
• 1/4 teaspoon baking powder
• 2 cups chopped pecans