Spray your baking pan with non-stick cooking spray.
In a small saucepan, add the beer and butter, and simmer until the butter is melted.
Remove from heat, and mix in the sugar, and cocoa powder. Add in the eggs, sour cream, and vanilla extract. Fold in the flour, baking soda, mix until smooth.
Pour your batter into the prepared pan.
Set the baking pan to a 320 degrees F, air fryer setting, and bake for 15 to 20 minutes.
Bake until a toothpick comes out clean, when placed into the middle of the cake.
While the cake is cooling. Make your frosting, add the cream cheese, and powdered sugar, and cream, and mix.
Spoon over the cake and frost.
Plate, serve and enjoy!