Step 1

Heat oven to 375°F.

Step 2

Stir together flour, cocoa, baking soda and salt. Beat butter, granulated sugar, brown sugar and vanilla in large bowl on medium speed of mixer until creamy. Add eggs; beat well. Gradually add flour mixture, beating well. Stir in chocolate chips. Add nuts, if desired. Drop by rounded teaspoons onto ungreased cookie sheet.

Step 3

Bake 8 to 10 minutes or until set. Cool slightly; remove from cookie sheet to wire rack.