Bakery fillings are the creams, custards, fruit preparations, ganaches, and nut pastes piped, spread, or deposited into cakes, biscuits, and pastries. They must balance flavour with stability, holding their texture through baking, freezing, thawing, or ambient storage without weeping, bleeding colour, or separating. Because many fillings are high in moisture and rich in nutrients, their water activity and pH are engineered to resist microbial spoilage, and bake-stable formulations are designed to survive oven temperatures without boiling out. Hygienic depositing, rapid cooling after preparation, and chilled storage of finished goods keep these indulgent centres safe as well as delicious.