Mix all ingredients together in a small bowl or container. Let it sit for a couple minutes and then give it another good stir. Cover and let the pudding thicken in the fridge for at least 2 hours (or overnight).
Taste the pudding and add more spices as desired. Option to top the pudding with a small sprinkle of cinnamon, a few chopped walnuts or some banana slices.
Notes
Chia seeds are low FODMAP at 2 tablespoons. If you have never had chia seeds before, start with eating 1 or 2 teaspoons per serving and slowly increase over time.
Canned pumpkin is low FODMAP at 1/4 cup.
Will last about 5 days in the fridge (or less if your milk is close to the expiry date).