Cheesy Sweet Potato Skillet Bake in One Cast Iron Pan Step-by-step instructions

Before you start

Gather every ingredient and tool before you turn on the stove, because the cooking moves quickly once the skillet is hot. Preheat the oven to 400°F (200°C) and set a rack in the middle position so the skillet sits level and the cheese browns evenly. Peel the orange sweet potato and cut it into small cubes of roughly equal size, then cut the red bell pepper into thin strips.

Slice the whole green chili peppers and set them on the board beside the sweet potato. Pick the cilantro leaves from the stems and slice the red chilies for garnish. Set aside the tortilla chips in a bowl. Grate the white cheese just before you need it, using the coarse side of a box grater, and keep the shreds in a pile on a plate so they stay loose.

Instructions

Cook the vegetables in the skillet

1. 1Cut the sweet potato and peppers
   Peel the orange sweet potato and cut it into small cubes with a chef's knife. Cut the red bell pepper into thin strips and slice the green chili peppers. Keep the vegetables on the board until the skillet is hot.
   Look for Sweet potato cubes are even in size and roughly the same bite-sized dimensions.
   Tip Smaller cubes cook through in the same time as the peppers and soften faster.
2. 2Heat the cast iron skillet
   Set the cast iron skillet over medium-high heat and add the oil. Let it heat for about two minutes until it shimmers. Add the diced sweet potato and sliced red pepper first so they begin to brown.
   Look for The oil shimmers and moves easily across the pan surface.
   Tip A preheated cast iron pan gives the vegetables color instead of steaming them.

After about 10 minutes of sautéing, the sweet potato cubes should be tender enough to yield to a fork and show light golden edges on several sides. The red pepper strips should soften slightly and take on a few darker spots. The green chilies will look glossy and blistered on their skins. The pan should smell sweet and toasty, with no harsh or burnt aroma.

Before you move on, check that no cubes remain hard in the center, and stir the bottom of the skillet to lift any browned bits so they blend into the vegetables. If a piece still feels firm, cook another minute or two over medium heat, then continue. The vegetables are ready once they hold their shape while looking soft enough to spread easily in the melted cheese.

Melt the cheese over the vegetables

3. 3Sauté the vegetables
   Add the green chilies and the kosher salt. Stir with a metal spatula every minute or so for about 8 to 10 minutes, until the sweet potato softens and the edges take on a little golden color.
   Look for Sweet potato pieces yield to a fork and show light golden spots.
   Tip Scrape the bottom of the pan often so the browned bits blend into the vegetables.
4. 4Grate the cheese
   While the vegetables cook, grate the white cheese block over a box grater so it falls in fine shreds. Pile the shreds on the board until you have about 8 ounces, ready for the skillet.
   Look for Fine shreds pile loosely and look fluffy rather than clumped.
   Tip Grate the cheese just before using so it melts evenly and does not dry out.
5. 5Top with cheese and melt
   Reduce the heat to medium and scatter the shredded cheese over the simmering vegetables. Stir gently until the cheese begins to melt into the vegetables, about 2 minutes.
   Look for The cheese softens and starts to pull together into a glossy layer.
   Tip Keep the heat moderate so the cheese melts without scorching on the pan bottom.

Once the shredded cheese has been scattered over the simmering vegetables for about two minutes, it should begin to soften, turn glossy and cling to the sweet potato and pepper pieces. The surface will look melted in patches, with some shreds still holding their shape. The skillet should give off a rich, savory smell of cheese mixed with the sweetness of the vegetables.

Check that the heat is moderate and that the cheese is not browning or sticking to the pan bottom. Stir gently so the melted cheese coats the vegetables evenly, and make sure the mixture is spread out across the skillet before you move it to the oven. If the cheese still looks mostly unmelted, give it one more minute on the stovetop before going on to the bake.

Bake until bubbling and golden

6. 6Spread and bake until golden
   Spread the melted cheese evenly across the top of the skillet with the spatula. Transfer the skillet to an oven preheated to 400°F (200°C) and bake for 10 to 12 minutes, until bubbling and golden in spots.
   Look for The surface bubbles at the edges and shows golden blisters across the top.
   Tip Use oven mitts to handle the hot skillet, since the handle stays very hot.
7. 7Garnish and serve hot
   Let the skillet rest for about 5 minutes so the cheese sets slightly. Scatter fresh cilantro leaves and sliced red chilies over the top. Serve hot in the skillet with tortilla chips for dipping into the stretchy cheese.
   Look for The cheese holds a soft, creamy texture and pulls into long strands when lifted.
   Tip Serve straight from the skillet so the cheese stays warm and stretchy.

After 10 to 12 minutes in the oven, the cheese across the top should be bubbling at the edges and browned in spots, with a few golden blisters showing across the surface. The skillet should be hot all the way through, and the sides should look slightly darker where the cheese has crisped. The dish should smell warm and nutty from the browning cheese. Before serving, check that the center of the dish is bubbling and that the cheese looks melted and stretchy rather than dry or crumbly. Let the skillet rest for about 5 minutes so the cheese sets slightly, which makes it easier to scoop and dip, and then add the cilantro and sliced red chilies.

Common mistakes

The most common mistake is adding the cheese too early over high heat, which causes it to scorch and separate before the vegetables are ready. Another frequent error is cutting the sweet potato cubes unevenly, which leaves some pieces raw while others turn mushy. Crowding the skillet also causes steaming instead of browning, so spread the vegetables in a single layer as much as possible and stir them with the spatula to avoid sticking.

Using pre-shredded cheese is a mistake too, because the starches in the packaging keep the melt grainy instead of smooth. Finally, skipping the rest after baking means the cheese runs off the sweet potato when you scoop, so give the skillet a few minutes to settle before serving.

How to tell it’s done

The bake is done when the cheese across the top bubbles steadily at the edges and shows golden spots in several places. The sweet potato cubes should feel tender when pierced with a fork, with no firm centers remaining. The cheese should look melted and stretchy rather than dry or grainy, and it should pull into long strands when you lift a chip. There is no raw protein in this recipe, so the cooking is judged by texture and color rather than an internal temperature. If the top is pale after the full bake time, run the skillet under the broiler for one minute, watching it closely so the cheese does not burn.