Microwave Caramel Popcorn

2 quarts popped popcorn (or 1 microwave bag unsalted, un-buttered popped popcorn)
1/2 cup brown sugar
1/4 cup unsalted butter
1/8 cup light corn syrup
1/4 teaspoon salt
1/2 teaspoon vanilla extract
1/4 teaspoon baking soda

Pop the popcorn and put it in brown paper bag (or keep it in the bag if it's the microwave kind). In a microwavable bowl, mix the brown sugar, butter, corn syrup, salt and vanilla. Heat for 1 1/2 minutes (I'd put something underneath just in case it boils over). Stir. Heat for another 1 1/2 minutes. Remove from microwave, stir in the baking soda. Pour syrup over the popcorn in the bag. Roll down the top once or twice and shake shake shake, covering all the popcorn. Stick the bag in the microwave and cook for 45 seconds. Flip over, and cook for another 45 seconds. Dump the bag onto wax paper until cool. Yum yum! (and don't forget to floss - popcorn almost inevitably gets stuck in my teeth. :)