Potatoes can be cooked in many ways and are often used as side dishes, with one being a potato gratin. This dish is quite simple to make and takes less than an hour to prepare. If you're looking for a different way to cook this simple vegetable, then try making a potato gratin. You'll find it a delicious addition to any meal.
Preheat the oven to 190 degrees C (375F). Coat the inside of the casserole dish with butter.
Peel four large potatoes and rinse them under cold running water. Cut the potatoes into thin slices and put them in the casserole dish.
Add 250 ml (1 cup) of milk to a heavy saucepan, along with the salt, pepper and onion and garlic powder. Stir together to mix.
Place the pan on the hob and cook on medium heat. Add the flour and stir briskly with a whisk for one minute, making sure you get all the lumps out. Use either all-purpose or self-raising flour for the sauce.
Pour another 250 ml (1 cup) of milk to the mixture. Continue cooking and stirring until the sauce becomes slightly thick. Add the grated cheddar cheese to the milk sauce and stir until the cheese is melted.
Put 75 ml (5 tbsp) of butter on top of the sliced potatoes, with a spoonful in each corner and one in the middle. Pour the cheese sauce over the potatoes, making sure to cover all the potatoes. The cheese sauce will seep to the bottom of the casserole dish, so stirring isn't necessary
Bake uncovered for 1.5 hours or until the potatoes become soft and tender. Take out of the oven and let the dish cool for about 10 minutes before serving.