Overmixing spells disaster for delicate baked goods because the longer you mix dough or batter ... away every small lump in the batter, but focus on the big picture. Lumps are OK as long as ...

If you've ever baked with berries ... Fold the dredged items in carefully to avoid over-mixing the batter, and you'll end up with picture-perfect muffins and quick breads every time.