Why Is My Ermine Frosting Separating? On: July 7, 2022. Asked by: Arely Cormier. Advertisement. Frosting is too runny. This could be because the butter was too soft or you added too much milk if it is buttercream frosting or it could be that you have overbeaten it if you’re making cream cheese frosting. Also, a hot kitchen can make frostings I just made diplomat cream to use with cream puffs, everything was fine until i added the whipped cream to the pastry cream, it came out a bit too runny to hold its shape, and when i try to pipe it just trickle down the side of the puff. How can i thicken it back up? What recipe did you use? XYoe.

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