When you want a creamy, comforting gratin without turning on the oven, this microwave cheesy potato gratin is an easy option. The potatoes are quickly cooked in the microwave, then topped with a thick garlic cream sauce and plenty of melted cheese. A thin layer of ketchup or tomato sauce adds a little brightness that balances the richness of the cream and cheese.
Enjoy fluffy potatoes, smooth garlic cream sauce, and stretchy melted cheese in a satisfying dish that comes together in about 15 minutes.
⏱️ Cooking Time: About 15 minutes
🍳 Difficulty: ★☆☆☆☆
✓ Ingredients
🥣 Main Ingredients
- 2 large potatoes, about 500 g (17.6 oz)
- 250 ml (8.5 fl oz) heavy cream
- 150 g (5.3 oz) shredded mozzarella cheese
- 2 tbsp grated Parmesan cheese
🧂 Sauce & Seasonings
- 2 tbsp minced garlic (1 tbsp for the potatoes, 1 tbsp for the cream sauce)
- 1 tbsp olive oil
- 2 tbsp ketchup, or tomato sauce
- 2 pinches salt
(Measurement guide: 1 tbsp = 15 ml, 1 tsp = 5 ml, 1 Korean paper cup = 180 ml / 6.1 fl oz)
✓ How to Make Microwave Cheesy Potato Gratin
- Season and microwave the potatoes: Peel the potatoes and cut them into large chunks. Place them in a microwave-safe container, then add 1 pinch of salt, 1 tbsp minced garlic, and 1 tbsp olive oil. Toss lightly, cover with plastic wrap, poke a small vent hole, and microwave for 7–8 minutes until completely tender.
- Reduce the garlic cream sauce: Add 250 ml (8.5 fl oz) heavy cream, 1 tbsp minced garlic, and 1 pinch of salt to a large saucepan. Cook over medium heat, stirring with a spatula, until the cream reduces and becomes thick. Use a generously sized saucepan because the cream can foam up and overflow as it boils.
- Mash the potatoes: Roughly mash the fully cooked potatoes with a fork or spoon, then spread them evenly across the bottom of the microwave-safe dish.
- Add the sauces: Spread the reduced garlic cream sauce evenly over the mashed potatoes. Add 2 tbsp ketchup or tomato sauce in a thin layer over the cream.
- Add and melt the cheese: Cover the potatoes generously with mozzarella and sprinkle the Parmesan over the top. Microwave for another 2–3 minutes, until the cheese is completely melted.
- Brown the cheese: Once the cheese has melted, lightly brown the surface with a kitchen torch for a toasted finish. If you do not have a torch, cook the gratin in an air fryer at 180°C (356°F) for 3–4 minutes until lightly golden.
✓ Key Tips for Success
- Do not add butter to the cream sauce: Adding butter while reducing the heavy cream can cause the fat to separate and leave an oily layer on the surface. Keep stirring with a spatula so the cream does not stick to the bottom of the pan, and reduce it until thick and creamy.
✓ Serving Tips
- Add bacon or shrimp: Top the potatoes with cooked bacon pieces or sautéed cocktail shrimp before adding the cheese for extra texture.
- Use tomato pasta sauce: Replace the ketchup with store-bought tomato pasta sauce for a brighter, deeper tomato flavor.
- Finish with herbs or pepper: Sprinkle lightly with dried parsley or coarsely ground black pepper before serving for a cleaner finish.
✓ How to Choose Good Potatoes
- Shape and size: Choose potatoes with an even overall shape, without dents or unusual curves, and look for pieces that are relatively uniform in size.
- Skin and eyes: Select potatoes with dry skin that is free from cuts or damage. Potatoes with fewer, shallow eyes are preferable.
- Color and sprouts: Look for potatoes with an even skin color and no visible sprouts. Avoid potatoes whose skin has turned green from exposure to light.
✓ Potato Nutrition per 100 g (3.5 oz)
| Nutrient | Amount per 100 g (3.5 oz) |
|---|---|
| Calories | 70.00 kcal |
| Carbohydrates | 16.07 g |
| Protein | 1.93 g |
| Fat | 0.03 g |
| Sodium | 1.00 mg |
Based on 100 g (3.5 oz) of raw Sumi potatoes. Actual nutrition may vary depending on variety, product, and cooking method.
Source: Ministry of Food and Drug Safety Food Nutrition Database – Raw Food Ingredients
✓ Frequently Asked Questions (FAQ)
Q1. How do I make sure the potatoes cook all the way through in the microwave?
Cut the potatoes into large chunks, cover the container with plastic wrap to keep the moisture in, and poke a small vent hole. Microwave for about 7–8 minutes, then check with a chopstick or fork; the potatoes are ready when it slides in easily.
Q2. Why does the heavy cream separate or overflow while cooking?
Adding butter can make the fat separate more easily, and heavy cream expands quickly as it boils. Use a large saucepan and cook over medium to medium-low heat while stirring continuously to control the foam and prevent sticking.
Q3. Can I use regular milk instead of heavy cream?
Yes. Regular milk can be used, but it contains more water than heavy cream and will produce a thinner sauce. Cook it over low heat for a little longer, stirring continuously, until it reduces and thickens.
You do not need to boil the potatoes separately or preheat an oven for a long time to make a soft, creamy microwave cheesy potato gratin. Using the microwave keeps the process simple while still giving you tender potatoes, a rich garlic cream sauce, and plenty of melted cheese.
You can also customize it with bacon, shrimp, or tomato pasta sauce, making it useful as a quick snack or a filling meal.
Save or bookmark this recipe for the next time you want an easy cheesy potato dish, and share it with someone who loves simple comfort food.
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