If I'm reaching for a book to genuinely lift my mood, I need a few boxes ticked: a clear happy-ever-after, low angst stakes, and characters I can root for without getting my stomach in knots. 'Legends & Lattes' by Travis Baldree is my absolute comfort standard now. It's basically about an orc warrior opening a coffee shop. The conflict comes from sourcing cinnamon, not world-ending catastrophe. The friendships feel earned, the romantic subplot is sweet and straightforward, and the ending leaves you with this warm, fuzzy feeling of a community built from scratch.
On a slightly different note, T. Kingfisher's 'A Wizard's Guide to Defensive Baking' manages to be whimsical and surprisingly profound without ever getting too heavy. Yes, there's a murder mystery and a city in peril, but the tone stays so wonderfully matter-of-fact through the protagonist's eyes. The resolution is clever and feels deeply right for the characters, reinforcing themes of using the talents you have, however odd they seem. It closes on a note of hard-won peace and freshly baked bread, which is just about perfect.