Preheat the oven to 180℃.
Take a single serve bakeware or dish. I have used a 13oz (4.5" square one). Can use any you have or use a foil one.
Apply half of the butter on the base and the sides of the dish.
Slice the peach. Leave a couple of slices for the topping.
Melt the remaining butter. I put the bowl containing the butter in hot water. It melts the butter within 2 minutes or less. I usually use a steel one.
Mix the oats, cinnamon powder and salt in one bowl.
In another bowl or a jug add milk, egg, vanilla extract, maple syrup and melted butter.
Whisk it to mix.
Layer the peach slices in the buttered dish.
Sprinkle the oat mix over the peach slices.
Pour in the egg mixture.
Put the dish in the preheated oven.
Allow the oatmeal to bake for 30-35 minutes.
Insert a toothpick in the middle of the baked oatmeal. It should come out almost clean if it is baked well.
Add the peach slices you saved for the topping.
Add a dollop of Greek Yogurt or whipped cream and enjoy.