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Potatoes with Roasted Poblano Chillies and Mexican soured cream (Papas con Rajas y Crema Ácida)

This authentic vegetarian dish, known in Mexico as papas con rajas, brings together the earthy flavour of waxy potatoes with the mild, smoky heat of roasted poblano chillies. The secret to its success lies in the contrast between the slightly charred, silky chilli strips and the rich, tangy Mexican crema. It is a comforting and savoury staple that showcases how simple ingredients can be transformed through traditional roasting techniques.

Ideal as a side dish for a weekend feast or served as a substantial taco filling, this potato recipe is both versatile and satisfying. Using waxy potatoes ensures the cubes maintain their shape during the simmering process, while a short resting period allows the sauce to thicken into a luxurious coating. This homemade classic is a wonderful introduction to regional Mexican home cooking.

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Ingredients for Potatoes with Roasted Poblano Chillies and Mexican soured cream (Papas con Rajas y Crema Ácida)

  • 5 large poblano chillies, stemmed, seeded, and veins removed (or not, depending on how spicy you want this to be)

  • 2 large Yukon gold potatoes or another waxy potato, cut into 1/2-inch / 12mm cubes

  • 1 tablespoon sea salt, plus more as needed

  • 1 tablespoon safflower oil

  • 1 large white onion, thinly sliced

  • 240ml / 240g Homemade Mexican Crema or crème fraîche

On an ungreased comal or in a cast-iron skillet over high heat, roast the chillies, turning them over every couple of minutes using tongs or your hands (carefully, so you don’t get burned). You’re looking for uniform blistering, but you don’t want them to become too soggy in the process, especially if you intend to stuff them, since they need to hold their shape. The process will probably take 10 to 15 minutes. Once they are well blistered and before the flesh is completely charred through in any spots, place the peppers in a plastic container with a tight-fitting lid or in a bowl that you can cover with a plate (not a towel or anything porous) and set aside to “sweat” for about 10 minutes, or until they are cool enough to handle.

Remove the charred skin from the whole chillies. Once you have removed and discarded the skin and seeds, cut them into rajas, or strips, about the width of fettuccine.

In a small saucepan, cover the potatoes with 2 inches / 5cm water and add the salt. Bring to a boil over medium-high heat, then decrease to low and simmer for about 5 minutes. Remove one of the potatoes and taste it. The piece should be soft but not falling apart, still holding its cube shape. Cubed like this, they will cook quite quickly, so be attentive. Once they have the right texture, drain the potatoes and set aside in a medium bowl with a lid or cover the pan with a plate to keep them warm.

Using the same comal or skillet in which you toasted your chillies, heat the oil over medium-high heat until it’s hot but not smoking. Add the onion and sauté until it’s translucent but not browned.

In a saucepan, combine the potatoes, chillies, onion, and crema or crème fraîche. Bring to a boil, then turn off the heat and let it sit for 5 to 10 minutes. As the mixture cools, the starches will absorb some of the melted cream and help it firm up. Taste and add more salt if needed. Serve as you wish!

Do Ahead: These potatoes can be stored in a sealed container in the refrigerator for up to 2 days.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

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UK recipe editors

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Article history

The information on this page is peer reviewed by qualified clinicians.

  • 28 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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