Chocolate Espresso Walnut Cookies

Ingredients
1 pound semisweet chocolate, chopped
1/2 cup (1 stick) butter
3/4 cup (3 ounces) unbleached flour
1/2 teaspoon baking powder
1/2 teaspoon salt
4 extra-large eggs
1 1/2 cups sugar
2 tablespoons instant espresso powder
1 tablespoon vanilla extract
2 cups fine-quality bittersweet (56% to 60% cacao) chips or 1/4-inch chunks
2 cups coarsely chopped walnuts (about 8 ounces)

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