Chef's notes: Don't skip draining the pumpkin or freezing the centers; both are what keep these truffles from turning into a sticky mess. Store in an airtight container in the fridge for up to one week, or freeze for up to two months. Serve cold for the cleanest snap. For dairy-free, use dairy-free cream cheese and dairy-free chocolate; for gluten-free, use gluten-free graham crackers. White chocolate can seize if overheated, so melt in 30-second bursts and stir in a teaspoon of coconut oil if it stiffens.