To make the puffed rice topping, melt the butter and sugar together over a low heat until the sugar dissolves and you have what looks like a sauce. Make sure to stir and keep it on low heat so it doesn't burn!
Combine puffed rice and coconut flakes in a bowl, then pour the butter/sugar over it. Mix together well.
Add the coconut oil, spread on a lined baking sheet, and bake on 350 F (176 C) for 8-10 mins until crispy and golden brown. Stir if it seems like it is browning quickly, and keep an eye on it!
Make the porridge by combining the oats and milk in a pot on the stove with a pinch of salt. Cook over a low heat until you get the texture you like - keep adding milk or water if it gets too dry!
Assemble. Start with the porridge base on the bottom, then top with vanilla yogurt, the puffed rice topping, and a sprinkle of coconut flakes. Enjoy!
Save the leftover rice cereal topping in an airtight container for porridge the next day!