Put the trivet in an instant pot and pour one cup of water.
Grease the ramekin with olive oil.
In a bowl put flour, sugar, orange zest, cocoa powder, baking powder and salt and mix well.
Add milk, olive oil and egg into it gradually and make a batter.
Pour the batter into greased ramekins, place on the trivet and close the lid.
Cook for 10-15 minutes on manual “high” pressure.
Release the pressure naturally and take out the ramekin carefully. Serve.