Pawsitively Gourmet Valentine's Day Cupcake Dog Cookie

My puppy loved the cookie, but I wouldn’t let him eat much of it because I was afraid that he could have an allergic reaction to the ingredients. The description says sweet potato but it doesn’t say anything about the icing, or other ingredients used.

My really picky 4 pound Yorkie tore into this cookie that I bought him for his 2nd birthday. He absolutely loved it! My only disappointment is that I couldn’t find the ingredients listed anywhere. I called the store and was told it was safe for dogs, (I hope so, since they were for dogs!) But, I primarily would like to check the ingredients of the icing. Could someone please tell me what they are?