Try this Cream Cheese Frosting recipe
Overbeating fat-free cream cheese is the single fastest way to destroy this mixture, turning a cohesive spread into a watery paste. Standard frostings rely heavily on butterfat and full-fat dairy solids to trap air and maintain viscosity during mixing. When using fat-free cream cheese, however, those structural fats are entirely absent, leaving water and milk proteins exposed to mechanical shear forces that rapidly break down the emulsion. Controlling paddle speed and mixing only until the components bind prevents the trapped moisture from weeping out onto the cake surface.
Cornstarch acts as the primary stabilizer in this formulation, absorbing free water molecules that would otherwise liquefy the spread. Raw starches require precise handling because they lack the gelatinization power of cooked thickeners, meaning they must be thoroughly dispersed into the liquid components before cooling or resting occurs. While traditional baking history is filled with heavy buttercreams, this lighter variation adapts industrial thickening principles for home kitchens seeking reduced lipid profiles without sacrificing physical spreadability.