This recipe makes enough for about 6 servings (depending on how large your bowls or ramekins are). You can use any oven safe bowl for this. In the past, I've used larger bowls. Just make sure, if you use larger bowls or ramekins, you have enough puff pastry to cover them all.
Also, if you have leftover filling, it can be frozen. Rotisserie chicken can be used in place of roasted chicken breasts.