Preheat the oven to 350°F / 175°C. Spray a 7-inch x 11-inch baking/casserole dish with non-stick cooking spray and set aside.
In a medium bowl, mix the rolled oats, brown sugar, salt, sliced almonds, and cinnamon.
Spread half of the oat mixture evenly into the prepared dish. Scatter half of the blueberries and strawberries over the oats, then top that with the remaining oats mixture and the rest of the fruit. Give the baking dish a slight shake to help the ingredients settle into place.
In the same bowl you used for the oats mixture, combine the egg, vegetable oil, vanilla extract, and milk. Mix until everything is well combined, then pour the milk mixture over the oats and fruit.
Bake for 40 – 50 minutes or until the oats are golden brown, have set, and are tender.