In a large bowl, combine the brown sugar and cornstarch. Stir until there are no remaining clumps of cornstarch. Then, add the pumpkin puree, coconut milk, non-dairy milk, pumpkin pie spice, vanilla, and salt. Stir well with a spatula. See note.
¾ Cup Brown Sugar, 3 tablespoon Cornstarch, 2 ¼ Cup Pumpkin Puree, ⅔ Cup Canned Coconut Milk, ⅓ Cup Non-Dairy Milk, 1 tablespoon Pumpkin Pie Spice, ½ teaspoon Kosher Salt, 2 teaspoon Vanilla Extract