Add peaches and apples to cast iron skillet. Sprinkle ½ cup sugar and 1 tbsp cinnamon on top.
In a small bowl whisk together melted butter, flour, sugar, salt, baking soda and then add 1 tbsp La Vieja Fabrica Peach Fruit Spread. Whisk until well combined. Spread batter over peaches and apples until evenly coated.