Preheat the oven to 350 degrees F (180 degrees C). Spray an 8 x 8-inch baking dish or 9-inch pie dish with Nonstick Cooking Spray (as needed). Set aside.
In a large bowl, mix together the Old Fashioned Rolled Oats (2 cup), Chia Seeds (1/4 cup), Pumpkin Pie Spice (1 tablespoon), Salt (1/2 teaspoon), Milk (3/4 cup), the juice and zest from the Sunkist Orange (1), Large Egg (3), Maple Syrup (2 tablespoon), and Dried Cranberries (1/2 cup) until combined.
Pour into the prepared baking dish. Bake for 25 minutes, or until the top and edges are golden brown.
Let the baked oatmeal cool completely before cutting into individual servings. Serve with a dollop of Plain Greek Yogurt (to taste) on top.