My conversion is a little different from Dawn's>>>
I've been trying to convert my recipes from cups to weights, and here are some of the conversions I use:
1 cup white sugar = 7 oz.
1 cup brown sugar = 7 1/2 oz.
1 cup flour = 4 1/2 oz.
1 cup peanut butter = 9 oz.
1 cup shortening = 8 oz.
Based on these conversions (and using Excel to calculate for me
, I came up with the following:
3 eggs
1/2 tsp. salt
2 1/2 tsp. baking soda
7 cups flour
1 tsp vanilla
2 1/8 cups brown sugar (I'd round down to 2 cups)
4 1/2 cups white sugar
5 1/3 cups peanut butter
4 cups shortening
To cut the recipe in half, I'd use the following:
1 1/2 eggs*
1/4 tsp. salt
1 1/4 tsp. baking soda
3 1/2 cups flour
1/2 tsp vanilla
1 cup brown sugar
2 1/4 cups white sugar
2 1/2 cups peanut butter
2 cups shortening
(If I cut a recipe in half, and it calls for 1/2 egg, I usually just use either the white or the yolk, and call it a half.)
The conversions from weights to cups don't always come out with normal measurements, and for most ingredients, I can usually round it up or down to the nearest 1/4 cup, especially for the flour and sugar stuff.
FYI, for the peanut butter, most jars are 18 ounces, which should equal 2 cups.
Good luck with the recipe - I hope it comes out like the school's!