We have white cabinets & white appliances. The wall that connects the dining room and kitchen is light mocha. What color can we paint the other 3 walls that will warm up the kitchen. There are no windows.

I would suggest:
A warm brown, rich redish, not too dark chocolate with warm undertones for example:
Open the container of cocoa.
Use silver handles and accessories to add
brightness to the room.

Burnt orange and browns go well. A burnt orange with a clear crisp color would work well. Very hip color palette!