For the oatmeal: Preheat the oven to 350 degrees F. Grease a 2-quart baking dish or 8-inch square baking pan with nonstick cooking spray.
Stir together the oats, brown sugar and ⅛ teaspoon salt in a large bowl. Whisk together the almond milk, egg, vanilla and almond extract in a medium bowl. Pour the milk mixture into the oat mixture and stir well to combine.
For the topping: Stir together the almonds, oats, brown sugar, butter, flour, vanilla, cinnamon and ⅛ teaspoon salt in a medium bowl until evenly combined.
To assemble: Pour the oatmeal into the prepared baking dish. Arrange the berries (including any juices) over the oatmeal. Sprinkle with the topping. Bake until lightly browned and just set, about 50 minutes. Let cool on a rack for 10 to 15 minutes. Serve warm with a 2-tablespoon dollop of the yogurt, if using.