The actress was playing her comedy alter-ego Olga Keff in the video when she told her followers "one of her favourite lockdown recipes".
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It turns out her favourite is in fact a cheese sandwich with brown sauce, so gave the recipe and the cheeky quip.
She then joked: "Tell you what, if Chinese had stuck to cheese sandwiches we wouldn't be in this mess," before saying, "Bloody bats".
The joke is referencing the theory that COVID-19 originated in bats from the Wuhan wet markets.
Speaking in the video, Olga said: "Today we are going to make a cheese sandwich. It's a firm favourite of mine.
"We are going to use lactose free cheese. Can't go near cow's milk me, goes straight through me."
In the caption, she wrote: "#Olga #MrsKeff sharing one of her fave lock down recipes if you please."
Catherine is currently practising social distance with her husband Tom Pitfield and son Alfie.
The 36-year-old actress married fitness consultant Tom at Colshaw Hall in Cheshire, in front of family, friends and Corrie co-stars in June 2015.
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She wore a bespoke Philip Armstrong wedding gown, an off-the-shoulder lace creation with a mermaid silhouette and sheer panelling on the back and sleeves.
They welcomed their son Alfie later in the year, and during her stint on Strictly she admitted how much she missed her son while training in London.
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