Filling a slow cooker or Crock-pot to the brim may look nice (and productive), but it's not a good idea. That's because once the lid is on and contents are simmering, bubbling liquid near the cover can help to create a vacuum effect. And that can cause the contents to be siphoned out, unto your counter top. Keep the food level at least one inch below the top of the slow cooker for safe slow cooking.
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