Yogashiten Galaxy summary:

The Komugi-Family Cake-Shop "Sugar & Spice" has fallen on hard times. What was once a sprawling Business, built up by Nanoha's Grandfather, fell apart as soon as her Father succeeded the Business.Suddenly Aliens invade. Their Scanner identifies a Cake as a Potent Superweapon able to change the Course of the Galactic War. So the Private leading the Invasion decides to investigate further by baking Cake with Nanoha.