In a bowl mix the sourdough with the flour and water. If it feels a little dry, add some more water.
Add the sugar, vegetable oil, eggs and baking powder.
Mix well.
Let the batter allow to rest for at least 30 minutes.
Preheat the oven to 180 °C (or 360°F).
Prepare the muffin pan by either greasing it or putting silicone cups in.
Unwrap the Rolos.
Put 1 tbsp. of batter into each cup.
Then put 1 Rolo into each middle.
Fill the cups with the remaining batter.
Put a few chocolate chips into each muffin top.
Bake the muffins in the oven for about 25 minutes, until golden.
Take them out of the pan and let them cool.
Once cooled, drizzle them with caramel sauce.