How can I "make" an olive egger?

[NatJ]

Yes, that’s what I have. I went back and looked up the description on the farm and fleet website and they state that to create the F1 chicks they sell they use a Cream Legbar rooster over a Welsummer hen, which makes sense to me with what my girls look like and what i can expect. Not sure if I will be able to keep my CCL rooster long enough to get to have fertile hatching eggs from my hens as they are just now starting to lay and from watching him mount (I’ve only seen it a couple of times) he is very clumsy. But if i do end up with OE x CCL hatching eggs at least i know what the offspring will look like and what color eggs they will lay.

Since your hens have a Cream Legbar father and Welsummer mother, then breeding them to a Cream Legbar rooster should produce autosexing chicks (same sexing as pure Cream Legbars.)

Even pure Legbars can produce some chicks that are sort of in-between the male & female color patterns, and you might get more of those chicks in this case, but you might not. If you want to eventually breed a nice autosexing line of Olive Eggers, pick your breeding stock from among the easiest-to-sex chicks in each generation, and future generations should get progressively easier to sex.