I didn't measure the popcorn - just popped three batches of air pop (1/2 cup unpopped corn per batch) directly into the roaster pan. Since this recipe is basically double the microwave recipe, and I use two batches for that, I cut the butter, sugar, and corn syrup down - 1-1/2 sticks butter, 1-1/2 cups sugar, 1/4 cup plus 2 T. corn syrup - but if you like your popcorn more coated, just follow the original measurements. I also only used 1/2 tsp. salt and 1/2 tsp. vanilla. The print recipe is the way I made it, and I think it's perfect.
This is a great alternative to the microwave recipe. It takes longer to make, but it makes more in one batch. It tastes good, too! This stuff just does not last very long.