Everything in the OP plus a Zess T. Restaurant where you can order most recipes you can make in the Paper Mario game series

Ooooohhh, I like those ideas. Like the Punch-Out chocolate bar, Rare Candy has been officially produced before. It's a hard candy that supposedly tastes like ramune.

Casteliacones are a must.

Maybe an Earthbound/Mother themed restaurant? Onett in Earthbound was an affectionate parody of America anyway.

Splatoon Yogurt and Ice Climber snow cones

A seafood joint that sells Game & Watch octopus, inkling, and cheap cheap...

Kentucky Fried Cuccoo...

Got a new one. Of course there's always money in the Donkey Kong-themed banana stand.

Come on. Tropical Freeze Frozen Bananas.

Yeah, Mother has a lot of interesting food items so I thought about how that could work. Onett Burger Shop? Mammoth Burger sounds pretty damn good.

Kirby Marshmallow pop. Shaped like Kirby, and made of marshmallows, candy eyes, and some sort of cake inside.

Yoshi Eggs. Think of a large cadbury cream egg, with a hard shell exterior, and green colored cream inside.

Red potions and blue potions as a specialty drink sort of like butterbear. Blueberry or cherry with blueberry or cherry froth.

Mario head shaped pretzels.

Egg Scoopa Koopas.

Rare candies.

Bananas. ;)