In a medium skillet on medium heat, melt the margarine or "butter." Add bananas, cinnamon, and sweetener if using. Stir well, and cook for about five minutes, stirring occasionally. Meanwhile, prepare the tortillas: Warm the tortillas briefly in the microwave to make them pliable, then spread about 1 tbsp peanut butter on each tortilla. Divide the cooked banana equally onto the four tortillas. Seal the burritos on both ends and place in a heated skillet, about a minute per side. This melts the peanut butter and also seals the tortillas. These burritos are excellent for breakfast or a snack with a tall glass of soymilk or some hot coffee! This is really just a base recipe. You can make these with any kind of nut butter (soy nut, almond, cashew, or even tahini) or any fruit or combination of fruits (apples, pears, peaches, blackberries). The only fruits I wouldn't recommend are citrus fruits or fruits that are very watery, like watermelon. Feel free to experiment with seasonings too. I hope you enjoy this easy, yummy recipe!