You can use xanthan gum to thicken your chocolate pudding. It's a common thickening agent used in gluten-free and low-carb recipes. Add 1/4 to 1/2 teaspoon to the cream cheese mixture to incorporate it into the recipe before blending with the whipped cream. Thoroughly blend the xanthan gum and make sure that no lumps are left. Make sure to add xanthan gum only in small amounts. Adding too much can create a slimy texture, which is undesirable for chocolate pudding. Another ingredient you can add is egg yolks. While this recipe specifically omits eggs, you can use them if you want a thicker and creamier chocolate pudding. Temper the egg yolks properly to avoid curdling, and cook them with the cream to create a delicious custard base.