A Marla Mason novel!
She's an ass-kicking sorcerer who doesn't wear a leather catsuit, doesn't suffer from low self-esteem, doesn't wallow in angst, and is almost always absolutely certain she's right... even when she's dead wrong.
What about Broken Mirrors? It's got monsters. It's got sarcasm. It's got death, betrayal, ancient gods, dark doppelgangers, mirror worlds, wisecracks, artifacts, oracles, and magical daggers. Oh... and a cloak.