Puff pastry chocolate tart? I've got some remaining puff pastry left over (1 sheet, store bought, frozen).

I have seen recipes online for puff pastry chocolate tarts, like here https://www.allrecipes.com/recipe/76952/rich-chocolate-tart/

However, I don't have heavy cream now  so I plan on using the chocolate filling mixture from this recipe https://tasty.co/recipe/silkiest-chocolate-tart . But the recipe I just linked to above wants me to pour the mixture into the pre baked 'dough' and bake it further. 

But, the recipe that I first linked to is for puff pastry and I don't think you can bake it twice?

Sorry if I sound confusing. I just want to know if it would be fine if, I would just bake the puff pastry for a little in the oven, then pour the mixture (from second recipe) into the thing then bake it further?  Or does anyone have any suggestions (or any other recipes for a puff pastry chocolate tart sort of thing, that doesn't need cream?)
First of all, you can make the chocolate pudding in a saucepan (using a chocolate pudding mix), bake the puff pastry by itself in the oven for a few minutes and then spoon the pudding in to the puff pastry to make a delicious chocolate tart.

By the way, you can also do the same with fruit, such as apples, cherries, blueberries. You can either make a homemade fruit filling or buy canned fruit filling.
Good luck!