Preheat the oven to 375 °F. Lightly spray a 9x13-inch baking dish with nonstick spray.
In a large bowl, whisk together the yogurt, egg and egg whites.
Whisk in the sugar, honey and vanilla extract.
Add the baking soda, salt and spices.
Stir in the milk
Stir in the oats.
Transfer the mixture to the prepared baking dish. Bake for about 45 minutes, until golden-brown at the edges. A skewer or knife inserted into the center of the oatmeal should come out clean.