Creating the Gooey Chocolate Caramel Turtle Cake Roll is simple if you follow these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and line a 15×10-inch jelly roll pan with parchment paper.
2. Mix Dry Ingredients: In a bowl, sift together the flour, cocoa powder, baking powder, and salt. Set aside.
3. Whisk Eggs and Sugar: In a separate large bowl, whisk the eggs and granulated sugar until light and fluffy, about 3-5 minutes.
4. Add Vanilla and Water: Stir in the vanilla extract and water until well combined.
5. Combine Mixtures: Gradually fold in the dry ingredients into the egg mixture until just combined. Do not overmix.
6. Spread Batter: Pour the batter into the prepared jelly roll pan, spreading it evenly.
7. Bake: Bake in the preheated oven for 15-20 minutes, or until a toothpick inserted in the center comes out clean.
8. Cool the Cake: Once baked, remove from the oven and let it cool in the pan for about 5 minutes. Then, invert onto a clean kitchen towel dusted with powdered sugar.
9. Roll the Cake: Carefully peel off the parchment paper. Roll the cake with the towel starting from the short end. Let it cool completely while rolled.
10. Prepare the Filling: In a small saucepan over low heat, combine the caramel candies and heavy cream. Stir until melted and smooth.
11. Unroll the Cake: Once the cake is cool, gently unroll it from the towel.
12. Spread the Filling: Pour the caramel mixture over the cake, spreading it evenly. Sprinkle chopped pecans over the caramel.
13. Roll it Up: Carefully re-roll the cake without the towel. Wrap it in plastic wrap and refrigerate for at least 30 minutes.
14. Make the Ganache: In a saucepan, heat the heavy cream until just simmering. Remove from heat and stir in the chocolate chips until melted and smooth.
15. Coat the Cake: Remove the cake from the refrigerator and unwrap it. Place it on a serving platter and pour the ganache over the top, allowing it to drip down the sides.
16. Garnish: Drizzle additional caramel sauce over the ganache and sprinkle extra chopped pecans on top for decoration.

Follow these steps, and you will have an incredible Gooey Chocolate Caramel Turtle Cake Roll that will be the highlight of any dessert table!