Grease a 6 inch round bundt pan with pam baking spray and set aside
Using a standing mixer, cream together the butter, cocoa powder,sugar, egg and vanilla until combined and smooth
Beat in the sour cream, baking soda and salt until combined
Mix in ½ C flour followed by ¼ C of beer and mix until combined
Repeat until flour and beer is fully mixed in
Pour batter into the bundt pan and cover with foil
Pour 1 C of water into the pot
Place the bundt pan onto a trivet
Lock and seal the lid
Press the manual high pressure button and set the timer for 35 minutes
Once timer goes off, vent the steam
Once pressure is gone, remove the lid
Place the bundt pan onto a wire rack and allow to cool completely
Once cooled, remove cake from bundt pan and place onto a wire rack over cookie sheet