Yield: 2 dozen cookies
1. Melt the chocolate in the top of a double boiler set over simmering water; set aside to cool slightly. Combine eggs, sugar, oil and extracts in a large bowl; whisk to combine. Stir in the chocolate; set aside.
2. Whisk together the flour, baking powder and salt in a large bowl. Add chocolate mixture to flour mixture, stirring until well combined. Cover; refrigerate at least 3 hours.
3. Heat oven to 350 degrees. Spread confectioners' sugar on a plate; set aside. Scoop walnut-size balls of dough; roll each in the sugar. Place on a greased or parchment-lined cookie sheet 2 inches apart. Bake until edges are firm, about 10 minutes per batch. Remove cookies to a wire rack; cool.
Experiment with different spices in the powdered sugar. Cardamom, cinnamon, or even a touch of ground chile pepper would go well with the chocolate and vanilla in the cookies.