Hi Shirley, I commented on the breasts in the large comment above to everyone - but after rereading your question, I can see where you are coming from. In general (at least in the stores around Seattle where I shop) the packages marked "chicken breasts" are really the "half breasts" you were talking about - not a combination of the left & right sides for a full breast. My recipe counts each half breast as one breast of chicken, as most recipes do. Hope that is a good clarification for you, and happy cooking!
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