The 'Someone Like You' hitmaker - who has seven-month-old son Angelo with fiancé Simon Konecki - bonded with the veteran singer ahead of their performances at the Oscars earlier this year and they now speak regularly on the phone to share recipe tips.
A source said: ''Adele has got heavily into her cooking during her break from music to have her son and Barbra has always been fanatical about what goes into her food.
''They have been swapping notes about meals ever since they met.''
The pair discovered their shared love for food after Adele enjoyed dinner at Barbra's house, which was cooked by the 70-year-old superstar's personal chef, who specialises in healthy versions of regular meals.
And the British singer is also taking tips from her new pal in dealing with global fame.
The source added to The Sun newspaper: ''Adele finds her company very reassuring because she has been through the whole global fame thing and knows what it's like.''
Meanwhile, Adele and Simon have reportedly transformed the garden of their home in West Sussex, South East England, into a traditional British seafront.
The outdoor space boasts three deckchairs and matching beach huts.