Be (as) easy as one-two-three American British informal
To be extremely simple, basic, or intuitive without much skill or effort
I have worked for a famous restaurant as a chef, so cooking for a small party is as easy as one-two-three.
Making rainbow popsicles was as easy as one-two-three!
For Lisa, taking an English test is as easy as one-two-three.
Something easy or pleasant to do, especially by comparison to something
A legal matter that is very easy to solve
One needs to understand the basic techniques or primary details of something before taking actions that require greater skills
Especially easy
A simple, quick or evasive answer
The verb "be" should be conjugated according to its tense.
Indicates that something which initially seems bad but harmless can become much worse in the future or lead to a harmful development
Those pharmacies have put the price of face masks up. It'll be the thin end of the wedge, if others follow along.