Patatas Mayordomo are a wonderfully comforting Spanish side dish built on a simple idea: potato slices gently simmered in a creamy sauce of onion, butter and whole milk. The slow, covered cooking keeps every slice tender and lets the sauce thicken into something rich and velvety.
This is the kind of humble preparation that shows up alongside grilled meats and steamed fish all over Spain, and it needs only seven everyday ingredients. A little chopped parsley stirred in at the end adds a fresh green note that balances the mild sweetness of the onions.
Because the potatoes cook right in the milk, the timing depends on how thick you slice them. Aim for even slices about half a centimeter thick so everything finishes at the same moment, and keep the heat low so the milk never boils over.

The finished dish should be spoonable and creamy rather than soupy, with potatoes that hold their shape but give way easily under a fork. It is just as good made ahead and gently reheated, which makes it handy for a busy weeknight.

Ingredients for Patatas Mayordomo
This makes 2 generous servings as a side dish.
- 400 g potatoes
- 80 g onion
- 40 g butter
- 1 tablespoon parsley leaves
- 200 ml whole milk
- Salt
- Ground black pepper

How to Make Patatas Mayordomo Step by Step
1. Slice the potatoes and onion
To get delicious Patatas Mayordomo, cut all the potatoes to the same thickness, somewhere between one and a half centimeters, though keep in mind that the cooking time will vary depending on how thick you slice them. The onion, on the other hand, should be cut very fine so it blends better into the sauce and the final texture of the dish is very creamy.

2. Sauté the onion in butter
Sauté 80 g of onion cut into thin slices in a pot with 40 g of butter over medium heat until the onion is soft and translucent. This will take about 10 minutes.

3. Add the parsley and milk
Next, add 1 tablespoon of chopped parsley leaves and then pour 200 ml of whole milk into the pot. Season with salt and pepper to taste.

4. Add the potatoes and cook for 30 minutes
Add the potatoes, which will be almost covered by the milk. Cook over low heat with the pot covered for 30 minutes, stirring gently from time to time so the potatoes cook through completely.

5. Serve
After this time, the potatoes will be cooked and at their creamiest, ready to serve.

Tips for the Best Patatas Mayordomo
Keep the slices even
Uniform slices are the key to even cooking, so take your time with the knife. If your slices end up thicker than half a centimeter, expect to add a few extra minutes to the cooking time.
Watch the milk
Whole milk gives the richest, most flavorful result, though you could use cooking cream for an even richer dish at the cost of lightness. If the milk evaporates too quickly during cooking, simply add a little more to keep the potatoes covered.
Serve it alongside everything
Patatas Mayordomo are ideal with countless dishes, from grilled meats to steamed fish. Their mild, creamy flavor makes them an easy partner for almost any main course.
| Prep time | 5 minutes |
|---|---|
| Cook time | 40 minutes |
| Total time | 45 minutes |
| Servings | 2 |
| Category | Side dish |
| Cuisine | Spanish |
| Calories per serving | 409 kcal |
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