In a large heavy saucepan, combine the butter, unsweetened chocolate, and 1 1/2 cups chocolate morsels. Cook over low heat, stirring constantly, until butter and chocolate melt; cool.
Whisk together flour, baking powder, and salt; set aside.
Beat the eggs, sugar, and vanilla at medium speed with an electric mixer. Gradually add the dry ingredients to egg mixture, beating well. Add the chocolate mixture; beat well. Stir in the remaining 1 1/2 cups chocolate morsels and the pecans.
Drop the dough by 2 tablespoonfuls 1 inch apart onto parchment paper-lined baking sheets. You can also use a silicone baking mat if you have one.
Bake for 8-10 minutes. Cool slightly on baking sheets before moving cookies to wire racks to cool completely.
Disclaimer: Nutritional values (per serving) are approximates only and will vary based on cooking methods and brands of ingredients used.
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