Preheat the oven to 350°F. Lightly grease a 8-inch square baking pan.
Measure the almond milk into a liquid measuring cup and add the apple cider vinegar. Set aside to curdle.
In a large mixing bowl, mix the pumpkin puree, maple syrup and coconut oil. Mix in the almond milk and beat until well incorporated.
Sift in the cornmeal, flour, baking powder, pumpkin pie spice, and salt. Stir just until combined.
Transfer the batter to your prepared baking pan. Bake until the top is golden and firm to the touch, 30 to 35 minutes. Let cool slightly before slicing.