
As that's the primary INGREDIENT
of baby powder...
The Big Bang Theory Season 4, Episode 21

It was always Sheldon's favorite.
You know what the secret INGREDIENT is?
The Big Bang Theory Season 1, Episode 4

I discovered
a secret INGREDIENT:
The Big Bang Theory Season 7, Episode 6

What secret INGREDIENT?
Breaking Bad Season 2, Episode 2

and my favorite INGREDIENT
of all, uniformity.
The Big Bang Theory Season 5, Episode 24