In a small saucepan over low heat, combine the sunflower oil, maple syrup, cinnamon, and cayenne pepper. Simmer for 1 to 2 minutes.
Place the popped popcorn into a 9x13-inch baking pan and pour the spiced mixture over the popcorn. Sprinkle with salt and stir to combine. Bake for 30 minutes, stirring every 10 minutes. Cool completely at room temperature, then transfer to airtight containers.
Recipe by Love and Lemons at https://www.loveandlemons.com/sweet-spicy-popcorn/