Enjoy life foods are free of the 8 major allergens. I love their double chocolate chip cookies.
I also thought the question implied you could bring a snack. I have used toy bags for parties when my children were young to include everyone ( No food)
As a teacher and one with severe anaphylaxis it's best to ask first, as my allergy can happen just from smelling something with natural strawberry. It's in fruit, candy, gummy bears, rollups, and some cereals or juice boxes.
I am a fan of food free classrooms....
It's always a good thing to ask the teacher what allergies are in the classroom. Then you can decide what to get from there. One year I had a classmate of my daughter who is allergic to all melon. So I had to be careful or fruit was brought into the classroom.