Prevent scorched edges
Use the stated water ratio and a cooker size that keeps the oat layer reasonably deep. A very large crock can overcook a small batch at the edges.
Do not substitute quick or rolled oats at the same time and liquid.
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Slow cook
Published
Cook steel-cut oats with apples and warm spices for a hands-off breakfast batch.

Use the stated water ratio and a cooker size that keeps the oat layer reasonably deep. A very large crock can overcook a small batch at the edges.
Do not substitute quick or rolled oats at the same time and liquid.
A programmable cook duration is useful; a delayed start that holds perishable dairy at room temperature is not.
This base recipe cooks with water. Add milk at serving unless the appliance recipe and food-safety guidance support another method.
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This is the one to buy for most people because it nails the core job of a slow cooker: steady low-and-slow results without babysitting.

The All-Clad is the upgrade for shoppers who want a higher-end, traditional slow cooker from a premium cookware brand.
Safety note: Refrigerate cooked oats within two hours and reheat portions to 165 degrees Fahrenheit.