Preheat the oven to 350-degreesspray a oven-proof pan with cooking spray.In a large saucepan, combine the oats, milk, sugar, salt and bring to a simmer. Cook over medium heat, stirring constantly for 15 minutes - until the mixture is the consistency of porridge.Remove the pan from heat.working quickly, stir the egg yolks into the oatmeal until the mixture is blended. Then fold in the berries and lemon zest.whip the egg whites in a stand mixer or with a hand mixer. Beat at medium speed until peaks form after about three minutes. Gently fold the egg whites into the oatmeal.Pour the mixture into the sprayed skillet pan and bake for 25 minutes.Serve immediately and garnish with whipped cream, confectioners sugar and/or syrup.