In a shallow baking dish whisk the milk, pumpkin puree, eggs, light brown sugar, salt, vanilla extract, pumpkin pie spice, and cinnamon together until combined.
3/4 cup milk, 1/2 cup pumpkin puree, 3 eggs, 2 tbsp light brown sugar, 1/2 tsp salt, 1 tsp vanilla extract, 1 tsp pumpkin pie spice, 1/2 tsp cinnamon