Cream butter and sugars. Add eggs and vanilla. Beat well. Stir in dry ingredients. Mix thoroughly. Add M&Ms. Bake at 350 F for 10-12 minutes. For large cookies, use ice cream scoop for measure and bake at 300 degrees F for 22 minutes.
Servings:varies, depending on size of cookies
Prep Time:20-25 minutes
Cooking Time:10-12 or 22 minutes, depending on size
Source: There was a note on this recipe that said it is a Mrs. Fields' blue ribbon recipe, so I guess the credit would go to her. :)
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