Preheat the oven to 375°F (190°C).
Prepare a 8x8-inch square (20x20cm) or 9-inch (23 cm) round baking dish (or similar baking dish) and grease it with 1 tablespoon of butter.
Add all the ingredients for the oatmeal except the oats into a medium bowl and whisk until very well combined. Next, whisk in the oats.
Pour the oatmeal batter into the baking dish.
Top with pecans and cranberries.
Bake for about 30 minutes or until the oatmeal is set but still creamy (not dry).
Leave to set and cool for about 5, then serve (I like it most with plain yogurt and maple syrup).
Enjoy!