best thing since sliced pan

as best one can

In the best possible way, given one's circumstances and abilities.

be a thing

To exist, or to be available, widespread, possible, or a common practice.

best bet

The best proposal or plan.

best laid plans

A proverbial expression used to signify the futility of making detailed plans when the ability to fully or even partially execute them is uncertain.

best of both worlds

A combination of two seemingly contradictory benefits.

best of the bunch

The best or most preferred person or item within a group.

best pleased

displeased, upset, disgruntled

best regards

Used as a polite closing of a letter