Hello everyone,

I have a excellent butter cake recipe and I am wondering if anyone knows how I would turn the recipe into a chocolate butter cake recipe.

Here is the recipe

1 cup (2 sticks) of butter (room temperature)
2 cups of sugar
4 eggs (room temperature)
3 cups of sifted self-rising flour (White Lily)
1 cup of whole milk (room temperature)
1 teaspoon pure vanilla extract (McCormicks)
1/2 teaspoon butter flavoring

How much chocolate am I suppose to add? chips, powder, or bar?

I appreciate your help. Thank you