JELLO POPCORN RECIPE.. .. 2 sticks butter (butter) 2 c. sugar, 1/2 c. dark corn syrup, 4 tbsp. Jello (any flavor) 1/2 tsp. soda 1 tsp. vanilla 16 c. popped popcorn Melt butter in saucepan. Add sugar and syrup and melt. Boil 2 minutes. Remove from heat. Stir in Jello, soda and vanilla; pour over popcorn. Bake at 250 degrees for 15 minutes, stir and bake 15 minutes longer. Remove from oven and break into pieces. Cool in clean bowls or pans, or it will stick.