Lemon Walnut Cake

Directions

1. 1
   Preheat oven to 350°F.
2. 2
   Generously grease a 12-cup bundt cake pan.
3. 3
   Dot rounded side of walnut or pecan halves with butter; arrange in flutes on side and bottom of pan.
4. 4
   Blend cake mix (dry), egg yolks, water, confectioner's sugar, 1/2 cup butter, and vanilla in a large mixer bowl on low speed, scraping bowl constantly, until moistened, about 1/2 minute.
5. 5
   Beat on medium speed, scraping bowl frequently, 3 minutes.
6. 6
   Do Not Overbeat!
7. 7
   Beat egg whites until stiff; fold into batter.
8. 8
   Carefully pour batter into pan.
9. 9
   Bake 40 to 45 minutes or until wooden toothpick inserted into center of cake comes out clean.
10. 10
    Cool 10 minutes on wire rack.
11. 11
    Remove pan; cool cake completely.
12. 12
    Sprinkle with powdered sugar if desired.