Quick answer
Mustard greens may fit only as a tiny occasional amount for cats. They should not replace the normal diet.
Use a tiny occasional amount only. This should not become a daily food.
Leafy green safety check
Can Cats Eat Mustard Greens?
Mustard greens may fit only as a tiny occasional amount for cats. They should not replace the normal diet.
Preparation
Wash and chop.
Watch-outs
Relevant for bearded dragon green rotation.
Why this answer changes by species
Cats usually rely on complete cat food. That makes mustard greens different from a generic human-food answer, especially around plant-heavy treats, dairy, alliums, and flavored leftovers.
Related foods for cats
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Sources used
FAQ
Can cats eat mustard greens?
Mustard greens may fit only as a tiny occasional amount for cats. They should not replace the normal diet.
How should mustard greens be prepared for cats?
Wash and chop.
What should I watch for with mustard greens and cats?
Relevant for bearded dragon green rotation.