1/2 C Butter
2 C Cream
1/4 C Parmesan Cheese
12 oz. Fettuccine
Recipe says will serve 3 (I'm not so sure)
How much of each would I need for 300?
Looking at it I think the pasta might be off in 2 ways:
First, 4 oz pasta per person seems a bit light, more like 6oz?
If so that would yield 2 servings per your "batch" not 3, or maybe more like 2.5.
Second, that should yield about 2 1/2 cups of sauce, which might service more thatn 12 oz.
To be safe, figuring say 3 servings per pound of pasta, that's what 33 pounds of pasta.
Best to make final adjustments during prep before serving.
Sounds about right to me, I usually figure 4 people to a pound pf pasta
Assuming that you go with their yield of 3 people, then for 300, it would be ingredients times 100.
12.5 G Cream
6.25# Parmesan Cheese