Melt the butter in a large nonstick skillet over medium heat. Stir in the orange juice, brown sugar and pumpkin pie spice and bring to a simmer. Slice the bananas and add to the skillet, stirring to coat. Saute until the bananas are tender and the sauce coats them, 2 to 3 minutes. Turn off the heat and add the bourbon. Light the liquid in the skillet with a click lighter and flambe, allowing the flames to subside. Turn on the heat and cook about 1 minute. Serve in bowls, warm, over vanilla ice cream with a sprinkle of nuts.
Use extreme caution when igniting alcohol. Remove the pan from the heat source before adding the alcohol. Pour the alcohol into the pan and carefully ignite with a match or click lighter. Return the pan to the heat and gently swirl to reduce the flames.