Preheat your oven to 350°F (175°C) and gather all your ingredients.

In a large mixing bowl, combine the rolled oats, brown sugar, cinnamon, baking powder, and salt. Stir the mixture well to ensure the ingredients are evenly distributed.

In a separate bowl, whisk together the eggs, milk, melted butter, and vanilla extract until smooth. Pour this liquid mixture into the bowl of dry ingredients, stirring until everything is thoroughly combined. Fold in the dried cranberries, ensuring they are evenly spread throughout the batter.

Transfer the mixture into a greased 9x13-inch baking dish, spreading it out evenly. Bake in the preheated oven for about 40 minutes, or until the top is golden brown and the oatmeal is set. Once done, remove from the oven, allow it to cool slightly, and serve warm. Enjoy the comforting flavors of this baked oatmeal!