2 cups chocolate syrup
1/2 cup peanut butter
In a large saucepan, sift together the chocolate syrup, peanut butter and lemon-lime soda. Place on a baking sheet and allow to cool completely. Cover with a damp cloth and let cool on the baking sheet.
Bake at 350 degrees F (175 degrees C) for about 10 minutes in the preheated oven, or until set. Remove from the heat and allow to cool completely. Refrigerate for several hours or overnight. Cut into squares and serve.