Making a German Chocolate Marble Cake with Ganache

Recipe:
1/2 stick butter
1-3/4 c flour
2 t baking powder
1t baking soda
1/2 t salt
3/4 c sugar
3 eggs
1t vanilla extract
2/3 c buttermilk
1/4 c + 1 T. Cocoa powder

Grease pan with Pam
Mix flour salt bpowder together
Beat butter, sugar till fluffy-5 mins
Add eggs one at a time
Add vanilla
Add half the flour mixture then 1/2 buttermilk mix until and repeat
In a smaller bowl, set aside 1/3 of the batter and then add the chocolate mixture
Spoon alternately each mix then with a knife, swirl through to make marbling
Bake 30-40 mins or until skewer comes out clean
Transfer on a plate
Glaze with ganache

Ganache
1 c semisweet mini morsels melted in double boiler or microwave
1T milk
2 T melted butter