Warm the milk slowly over medium-low heat and stir constantly to avoid curdling or scorching. If you don’t have a frother, whisk vigorously by hand or shake in a sealed jar to create froth. Use pure pumpkin puree, not pumpkin pie filling, for best flavor. For dairy-free, use oat or full-fat coconut milk. Adjust sweetness by reducing brown sugar or substituting with maple syrup or natural sweeteners.