Food Glorious Food from Oliver (which is a chorus number but can be sung by a duet or trio)
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.
"Too Good To Be Bad" from The Goodbye Girl "Pineapple Song" from Cabaret "I Can Cook Too" from on The Town "Who'll Buy" from Lost in the Stars might work as a duet - competing fruit sellers
"Mr. Goldstone" from Gypsy could be performed by a duo or trio.
Coach Bob knew it all along: you've got to get obsessed and stay obsessed. You have to keep passing the open windows. (John Irving, The Hotel New Hampshire)