Preheat the oven to 350 F. Grease a 9-inch baking pan, silicone or springform. If the baking pan is silicone, there is no need to grease it with anything. Mix all dry ingredients together in one bowl.
Then add the rest of the ingredients (milk, pumpkin puree) and make a pie batter using a spatula or whisk so it is smooth.
Place it in your 9" pan and put it in the oven on the middle rack. Bake for approximately 60-70minutes. For the first 30 minutes, the baking dish should be covered with foil, then remove the foil and continue baking.
The finished cake should be moist in the center; not dry but not liquid either. Top should be slightly cracked and pulling away from the sides of the pan.
Let it cool in the baking dish, then put it in the refrigerator covered with plastic wrap to set for 6 hours before serving.