Preheat oven to 325 degrees.
Rinse pumpkin seeds clean, and pat them dry.
Stir together brown sugar and cinnamon until fully combined.
Stir in melted butter until none of the mixture remains dry.
Stir in pumpkin seeds to coat with the butter mixture.
Spread seeds onto a foil lined baking pan.
Bake at 325 degrees for 20 minutes or until seeds are crisp.