Here is what a 20 amp outlet looks like vs a 15amp:

20 amp outlets have one receptacle with a T shape.

Most kitchens have 20 amp breakers and wiring, but they tend to use 15 amp receptacles. If you have the right wiring and have only 15 amp plugs, swapping them out with 20 amp plugs is pretty easy, but would be wise to consult with an electrician.