Heat oven to 375°F.
Grease and Flour Bundt pan.
Separate egg yolks from whites.
Beat egg whites until stiff peaks (best results with a stand mixer, but hand blender works also).
Add sugar and butter to egg yolks and beat until creamy (in the mixer).
Mix flour and baking powder.
Add milk, flour and egg whites to egg yolks a little at a time while beating with a mixer.
Split batter into 2 bowls; about half and half. (one will be vanilla, the other cocoa)
Add Cocoa powder to one of the bowls and stir in.
OPTIONAL - If using almonds, add almonds to bunt pan prior to pouring the batter.
Into the Bundt Pan: Pour all cocoa batter first, then add remaining batter from the second bowl.
Place in the heated oven and let bake for 60 minutes.