This one is Ryan's favorite!
You don't need a store bought package for microwave popcorn! Place 1/4 C popcorn kernels in a brown paper lunch bag. Fold down the top of the bag and crimp to seal. Microwave on high until popped, between 1 - 3 minutes, depending on your microwave. Do this until you have 6 C of popped popcorn.
Season with 1/4 t salt and transfer to a bowl. Add 3 T melted unsalted butter, 2 T brown sugar and 1/4 t pumpkin pie spice. Stir to mix and serve.