Preheat oven to 350 degrees.

Grease 8x8 pan.

Sift flour then measure, resift 4 times by adding the next four ingredients one at a time into a large mixing bowl.

Add butter, eggs, and vanilla. Beat at approximately 100 strokes per minute for 3 minutes, or 2 min on medium speed in mixer.

Remove beater, add nuts/chips and fold in until distributed.

Turn into pan and spread evenly.

Bake 20-22 minutes or until done. Chips seem to increase baking time.