Buttery Pound Cake

1 (18.25 ounce) box butter cake mix
1/2 stick butter, softened
1/4 cup vegetable oil
1 (8 ounce) container sour cream
3 large eggs

Heat oven to 350 degrees F. Grease and flour a tube or Bundt pan.

Mix all ingredients together well, at least 5 minutes. Bake in prepared pan for 50 minutes.