Melt butter in a large saucepan over medium heat. Add apples, brown sugar, cinnamon, salt and lemon juice and cook, stirring occasionally for 5 minutes. Add caramels and heavy cream and continue to cook until caramels are completely melted and apples are tender. approximately 8-10 minutes. Stir in peanut butter until completely smooth. Add additional heavy cream if desired for creamier.