Ingredients

•     Nonstick spray coating
• 8  cups  popped popcorn (about 1/3 to 1/2 cup unpopped)
• 3/4  cup  packed brown sugar
• 1/3  cup  butter (No substitutes)
• 3  tablespoons  light-color corn syrup
• 1/4  teaspoon  baking soda
• 1/4  teaspoon  vanilla

Directions

1. Spray an 18x12x2-inch baking pan with nonstick spray. Remove unpopped kernels from popped corn. Place popcorn in pan; keep warm in a 300 degreeF oven.

2. Butter sides of heavy 1-1/2-quart saucepan. Add brown sugar, butter, and corn syrup. Clip candy thermometer to side of pan. Cook and stir over medium heat to 255 degree F, hard-ball stage (about 4 minutes). Remove saucepan from heat. Stir in baking soda and vanilla; pour over popcorn. Stir gently to coat.

3. Bake in a 300 degree F oven for 15 minutes. Stir and bake 5 minutes more. Remove from oven; spread onto a large piece of foil and cool completely. Break into clusters. Makes 9 cups