How to Store: To store leftover roasted carrots with whipped feta, separate the components if possible. Keep the roasted carrots in an airtight container in the fridge for up to 3-4 days. Store the whipped feta in a separate airtight container, where it will stay fresh for about 3-4 days as well. When ready to serve, simply reheat the carrots in the oven or microwave, and serve the whipped feta chilled or at room temperature.