Slow Cooker Sweet Potato and Goat Cheese Gratin Step-by-step instructions

Before you start

Before beginning, ensure the slow cooker insert is clean and dry. Prepare the sweet potatoes by washing them thoroughly and peeling them if preferred, then slice them into rounds approximately 1/8-inch thick using a mandoline for precision.

Chop the fresh rosemary finely, discarding any thick, woody stems. Prepare all ingredients in advance to allow for a quick assembly, as the layering process is most efficient when all components are within arm's reach on the countertop, allowing the slow cooker to be filled and started without delay.

Instructions

Layering the ingredients

1. 1Layering the ingredients
   Place the bacon lardons evenly across the bottom of the slow cooker. Layer the sliced sweet potatoes on top of the bacon in an overlapping pattern to ensure even cooking throughout the dish.
   Look for The bottom is covered with a base layer of bacon.
   Tip Slice the sweet potatoes to a consistent 1/8-inch thickness for even cooking.

At this stage, the slow cooker should be neatly layered with bacon at the base, followed by a uniform arrangement of sweet potato rounds. Ensure the potatoes are distributed evenly to allow the cream to flow between the layers effectively.

The rosemary should be visible as a light dusting over the top layer of potatoes, ready to be infused into the cream during the cooking process. The assembly should look organized and compact, filling the insert without being packed too tightly to allow for steam circulation.

Seasoning and adding cream

2. 2Seasoning and adding cream
   Sprinkle the chopped fresh rosemary evenly over the layered sweet potatoes. Pour the heavy cream slowly and evenly over the top of the ingredients, ensuring it reaches the edges of the slow cooker insert.
   Look for The cream begins to settle between the potato slices.
   Tip Use a heavy cream with at least 36 percent milk fat for the best results.

After adding the cream, the liquid should be visible around the edges of the potato layers. It does not need to cover the potatoes completely, as the steam will help cook the top layer. The rosemary should now be moistened by the cream, ensuring its oils begin to release into the liquid. The assembly should look clean and ready for the heat, with the cream providing a rich, white base that will transform into a decadent sauce as it heats and combines with the rendered bacon fat.

Slow cooking the gratin

3. 3Slow cooking the gratin
   Cover the slow cooker with its lid and cook on high for 4 hours, or until the potatoes are fork-tender and the cream has thickened into a luxurious sauce. Allow the gratin to rest for 5 minutes before serving.
   Look for The potatoes are tender when pierced with a fork and the sauce is bubbly.
   Tip Check the tenderness after 3.5 hours as slow cooker heat levels can vary.

Once the cooking time is complete, the gratin should appear golden and bubbling at the edges. The aroma should be distinctly savory and herbal, filling the kitchen with the scent of roasted bacon and rosemary. The sweet potatoes should be soft and yielding to a fork, and the sauce should have thickened into a rich, coating consistency. The bacon should be fully integrated, providing savory bites throughout the dish. Let the gratin sit briefly to allow the sauce to set slightly before serving.

Common mistakes

A common mistake is slicing the sweet potatoes too thickly, which prevents them from cooking through at the same rate and results in uneven textures. Ensure all slices are consistent to guarantee even heat distribution.

Another error is over-seasoning with salt; since bacon is naturally salty, taste the dish only after the cooking process is complete and adjust accordingly. Finally, avoid lifting the lid frequently during the cooking process, as each time the lid is removed, the slow cooker loses significant heat, extending the cooking time unnecessarily.

How to tell it’s done

The gratin is finished when the sweet potatoes are completely fork-tender and offer no resistance when pierced. The heavy cream should have reduced and thickened, creating a creamy, cohesive sauce that binds the layers together. The bacon lardons should be cooked through and tender.

If there is excess liquid, remove the lid for the final 30 minutes of cooking to allow it to evaporate and thicken to the desired consistency. The internal temperature should be checked to ensure the dish is heated through thoroughly before serving.