INGREDIENTS
1
Egg yolk, large
2
Eggs, large whole
2 5/8 cups
All-purpose flour
2 1/2 tsp
Baking soda
4 oz
Chocolate, unsweetened
3/4 cup
Cocoa powder, Dutch process
1 1/4 tsp
Kosher or sea salt
1 1/2 cups
Powdered sugar
2 1/4 cups
Sugar
4 1/2 tsp
Vanilla, pure
1
inch Vanilla bean pod
1 cup
Canola oil
12 tbsp
Butter, unsalted
1 1/4 cups
Buttermilk
1/4 cup
Sour cream
1 1/4 cups
Whole milk