No practical kitchen appliance is going to draw more than 15 amps.
Assuming you have a 20 amp circuit, it is serving multiple outlets, and a typical use case would have multiple items powered up simultaneously at least some of the time. Thus the need for a single duplex outlet to support 20amps of actual current draw is pretty much zero.
Your existing outlet will have a rating on it, replace it with the same rating, which is almost guaranteed to be 15A and perfectly fine.
IMO, if you actually wanted a bona-fide 20A outlet, you'd want to have a dedicated circuit for it.
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