- In separate bowl from mixer, mix together almond flour, (whey or coconut flour) salt, baking powder, baking soda, sifted cocoa powder, xanthan gum. 
- In mixer, cream butter and Swerve. 
- Add eggs one at a time. 
- Add vanilla. 
- Put sour cream in measuring cup. Fill with milk up to 1/2 cup mark. (I use Fairlife, which is low-carb. You can use heavy cream if desired). This makes a buttermilk. 
- Add food coloring to buttermilk mixture. 
- Add almond flour mixture to sugar/egg mixture alternating with buttermilk mixture. 
- Add vinegar at the end. 
- Mix well. 
- Bake immediately for 15 minutes at 350 F./ 180 C.. 
- Cool and frost with cream cheese frosting found here.