Whipped cream isn't difficult to make, but it requires a watchful eye. Get distracted during the process and your creamy, fluffy clouds of dairy can become a stiff grainy mess. Luckily, over-whipped cream can be brought back from the brink; you just need more cream.
Photo by Claire Lower
If you do over-whip your cream past that soft peak stage and into the stage where it's starting to get stiff and clumpy, there's an easy fix: more cream! You'll want to switch to whipping by hand to do this fix: simply pour about an extra tablespoon of heavy cream into the bowl and whisk gently, adding more cream tablespoon by tablespoon until it's reached your desired consistency. It will actually come back from the edge.
Of course, this only to a certain point. If you start to see liquid fall away from clumps of cream, it's best to keep going until you have butter, and then rejoice because butter is delicious.
How to Save Over-Whipped Cream [Epicurious]