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["Melt butter and chocolate squares in 2-quart saucepan over low heat, stirring occasionally, until smooth(6-10 minutes).", "Cool 20 minutes.", "Combine melted chocolate mixture, sugar, 1 cup flour, cocoa, eggs, baking powder and salt in a large mixer bowl.", "Beat at medium speed, scraping bowl often, until well mixed.", "Stir in remaining flour and 1-1/2 cups chocolate chips by hand.", "Cover; refrigerate for at least 2 hours.", "Heat oven to 350 degrees F.", "Shape level teaspoonful of dough balls.", "Place 2"" apart on ungreased cookie sheets.", "Bake for 7-9 minutes or until edges are set and cookies begin to crack on top.", "Let stand 2 minutes; remove from cookie sheets.", "Cool completely.", "Melt 1/2 cup chocolate chips and canola oil in small microwave-safe bowl on HIGH for 1 minute.", "Stir until chips are melted.", "Drizzle mixture over cooled cookies.", "Let stand until chocolate is set(at least 30 minutes).", "Store in airtight conatiner up to 3 days.", "*TIP: For a fresh-baked flavor after storage, place cookie on paper towel; microwave on HIGH for 5 seconds.", "*.", "**Omit drizzle and sprinkle with sifted powdered sugar.", "**."]