In a bowl, mix flour and baking powder.
In another bowl, mix butter and sugar, then add the whisked egg and vanilla extract.
Slowly add the flour mix to the second bowl while stirring constantly.
Add milk the the mix and keep stirring.
Grease the bundt pan with baking spray
Pour the batter into the bundt pan
Pour water into the Instant Pot and correctly place the trivet.
Cover the pan with foil and place it on the trivet.
Close the lid and cook at high pressure for 30 minutes.
Once done, white for a natural steam release.
Let the cake cool a little, and then remove it from the pan and place onto a wire rack