Preheat the oven to 375 °F. Lightly spray a 13x9-inch baking dish with nonstick spray.
In a large bowl, whisk together the canned pumpkin and brown sugar.
Whisk in the egg and egg white.
Whisk in the vanilla extract, baking powder, cinnamon, ginger, cardamom, clove, salt and black pepper.
Stir in the milk
Stir in the oats.
Pour the entire thing into the prepared baking dish.
Bake for about 45 minutes. It's done when the edges start turning golden-brown and a knife or skewer inserted into the middle of the oatmeal comes out clean.