easy-peasy
adjective (informal)

very easy; presenting no difficulty at all

Collins Dictionary

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WORD ORIGIN

A possible origin of this phrase is as an extension of a 1950s TV advertising slogan for a lemon-scented washing up liquid product called ‘Lemon Sqezy’.

Although easy-peasy is a children's expression, adults will also use it together when in a light-hearted mood.

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SYNONYMS    

a piece of cake, a cakewalk, like stealing candy from a baby, as easy as falling off a log, it’s child’s play, it’s kid’s stuff, like shooting fish in a barrel, as simple as ABC, as simple as 123, as easy as can be, a turkey shoot, it’s a picnic, it’s plain sailing, duck soup

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In the field of linguistics, EASY-PEASY is an example of what is called 'rhyming reduplication', of which English contains many. Without context, would you have recognized these?

Postage Stamp - Lickie Stickie
Defibrillator - Hearty Starty
Bumble Bee - Fuzzy Buzzy
Pregnancy Test - Maybe Baby
Bra - Breastie Nestie
Fork - Stabby Grabby
Socks - Feetie Heatie
Hippo - Floatie Bloatie
Nightmare - Screamy Dreamy
Self Isolation - Lonely Homely
Thong - Peeky Cheekie
Fans - Spinny Windies
Chocolate - Easy Pleasy

Sources:

Andrzej Kollataj “Reduplication in English Rhyming Slang”
Iwona Piechnik “Reduplicative Syllables in Romance Languages”

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