Layer the ingredients inside of the jar one by one staring with the flour, then the brown sugar, white sugar, salt, cocoa powder and chocolate chips. .Use a pastry bag with the bottom of the bag cut off, a size just a little smaller than the opening of the jar to add each ingredient. Push the bag down to the bottom of the jar, then pour in each ingredient with a measuring cup. Close the jar and add twine or ribbon around the lid with a instructions card.