Pre-heat oven to 325 degrees

Grease and flour bundt pan.

Beat egg yolks, sugar, and butter until creamy.

With beater on low speed, add sifted dry ingredients alternating with sour cream after each addition.

In a separate glass bowl, beat egg whites until stiff not dry.
Fold the stiff egg whites into blended ingredients above.
Add flavoring and blend well.

Pour into prepared pan and bake for 1 hour and 15 minutes.

No peeking in the oven!