Steam the sliced pumpkin with a 5mm-height water in a pan for 3-4 min (or easier, in a microwave for 2-3 min) until tender. Mash until smooth.
With a (hand) blender, blend mashed pumpkin, plant-based milk, chai spices, maple syrup, and soy sauce, until silky and thoroughly mixed.
Pour into your favorite mug and warm up in a microwave for 30 sec -1 min. If you don't have a microwave, warm gently in a saucepan, and then pour into the mug. DO NOT let it boil!
Sprinkle some chai spice, and garnish with star anise (optional). Enjoy!