- Preheat the oven to 350°F. Prepare (butter & flour or spray with non-stick spray) two 8-inch round cake pans. 
- Sift together the flour, sugar, cocoa, baking soda, baking powder and salt in a large bowl. Set aside. 
- In a stand mixer add in the sour cream, vegetable oil and eggs. On low speed mix the ingredients together. 
- Gradually add the dry ingredients into the wet ingredients. 
- Beat on low until just combined, scraping down the edges as necessary. Be careful not to overmix. 
- Remove bowl from mixer and fold in the beer. 
- Divide the batter between the prepared pans and bake for 30 to 35 minutes, or until a cake tester comes out clean. 
- Cool the cakes in their pans for 10 minutes before carefully turning them out onto a cooling rack.