Prepare the Oven and Baking Dish: Preheat the oven to 350°F and lightly grease a 9×9-inch baking dish.
Whisk the Wet Ingredients: In a large bowl, whisk together the almond milk, eggs, maple syrup, Greek yogurt, melted and slightly cooled butter, vanilla extract, and almond extract until the mixture is smooth and well combined.
Add the Oat Mixture: Add the rolled oats, baking powder, cinnamon, and kosher salt to the bowl, then stir until the ingredients are evenly incorporated.
Fold in the Raspberries: Gently fold 1 cup of the raspberries into the oatmeal mixture, keeping the remaining 1/4 cup aside for the topping.
Fill the Baking Dish: Pour the oatmeal mixture into the prepared 9×9-inch baking dish and spread it into an even layer.
Add the Toppings: Scatter the reserved 1/4 cup raspberries over the surface, then sprinkle evenly with the sliced almonds and turbinado sugar.
Bake the Oatmeal: Bake at 350°F for 35 to 40 minutes, or until the center is set and the top is lightly golden.
Cool Briefly: Remove the baked oatmeal from the oven and let it cool for 5 to 10 minutes before serving.
Serve Warm: Serve the baked oatmeal warm on its own or topped with a dollop of Greek yogurt or a drizzle of almond butter.