Preheat oven to 300*. Make one batch of popcorn. Toss in the nuts if desired. Put butter, sugar, and maple syrup in a small saucepan. Add a pinch of sea salt. Heat the mixture on medium high. Be sure to keep stirring. Bring to a boil and allow it to boil for 2 minutes, without letting it burn! Carefully pour over the popcorn. Using a large wooden spoon, gently stir the popcorn until all of the pieces are coated. Spread the popcorn onto a buttered cookie sheet and bake for about 15 minutes. Enjoy!