Chocolate Fudge Cookies:
1 cup (115 grams) pecans or walnuts
1/2 cup (60 grams) cake flour
1 teaspoon baking powder
1/4 teaspoon salt
1 teaspoon instant espresso powder or instant coffee powder (optional)
1 pound (450 grams) bittersweet or semisweet chocolate, coarsely chopped
1/4 cup (57 grams) unsalted butter, cut into small chunks
1 3/4 cups (350 grams) granulated white sugar
4 large eggs, room temperature
1 tablespoon pure vanilla extract
1 cup (170 grams) semisweet dark chocolate chips
1 cup (170 grams) white chocolate chips
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