Here is a classic, foolproof recipe for Crockpot Scalloped Potatoes. Using a slow cooker is a fantastic way to make this dish because it frees up your oven, keeps the house cool, and results in incredibly tender, creamy potatoes.
The key to perfect crockpot scalloped potatoes is to avoid rinsing the potato slices (you want the starch to help thicken the sauce) and to use a low, slow heat so the cream doesn’t curdle.
Ingredients
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3 lbs Yukon Gold or Russet potatoes, peeled and sliced thinly (about ⅛-inch thick; a mandoline slicer helps a lot here)
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1 medium yellow onion, thinly sliced
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3 cups sharp cheddar cheese, shredded (divided)
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2 cups heavy cream or half-and-half (half-and-half is slightly less likely to curdle)
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3 tbsp all-purpose flour
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3 cloves garlic, minced
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1 tsp salt
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½ tsp black pepper
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½ tsp paprika (optional, for color)
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1 tsp fresh thyme leaves (or ½ tsp dried thyme)
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Cooking spray or butter (for greasing the crock)
Instructions
1. Prep the Slow Cooker
Generously grease the inside of your crockpot with cooking spray or butter. This prevents the edges from burning and makes cleanup much easier.
2. Make the Cream Mixture
In a large mixing bowl or a 4-cup measuring cup, whisk together the heavy cream, flour, minced garlic, salt, pepper, paprika, and thyme. Make sure the flour is completely dissolved so you don’t get lumps.
3. Layer the Potatoes
This step is important for even cooking.
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Place a single layer of potato slices on the bottom of the crockpot, slightly overlapping them.
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Sprinkle a small handful of the sliced onions and about ½ cup of the shredded cheddar cheese over the potatoes.
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Pour about ⅓ cup of the cream mixture over the layer.
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Repeat these layers (Potatoes -> Onions -> Cheese -> Cream) until all ingredients are used. You should end with a final layer of cheese on top. Note: Try not to fill the crockpot more than ¾ of the way full, or it may boil over.
4. Cook Low and Slow
Place the lid on the crockpot.
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Cook on LOW for 4 to 5 hours, or on HIGH for 2.5 to 3 hours.
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How to know they are done: A paring knife should slide into the center of the potatoes with absolutely no resistance. The sauce will look thickened and bubbly around the edges.
5. Rest and Serve
Once the potatoes are fork-tender, turn the crockpot off (or set it to the “Keep Warm” setting). Let the potatoes rest for at least 15 to 20 minutes with the lid slightly ajar or removed. This resting time is crucial—it allows the bubbling cream sauce to settle and thicken into a cohesive glaze rather than a runny soup.
Tips for Crockpot Success
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Don’t lift the lid: Every time you lift the lid during the first 3 hours, you release steam and heat, adding about 20–30 minutes to your total cook time.
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If the sauce breaks or curdles: This can happen if heavy cream is cooked too long on high heat. Using half-and-half, or cooking strictly on LOW, usually prevents this.
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Crispy top hack: Crockpots don’t brown food. If you want that golden, bubbly cheese crust you get from an oven, simply spoon the finished potatoes into a broiler-safe casserole dish and place them under an oven broiler for 3-5 minutes right before serving.
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Add protein: To make this a full meal, you can nestle diced, browned ham or cooked, crumbled bacon between the layers.