Using an electric hand mixer set on low speed blend in vegetable oil and melted butter until combined. Add eggs, egg yolks and vanilla extract and blend just to combined. Then add flour and blend until combined, and finish by blending in milk and sour cream just until combined.
Divide mixture evenly among 2 prepared pans. Bake in preheated oven until toothpick inserted into center of cake comes out clean or with a few moist crumbs, about 29 – 34 minutes. Allow to cool in pan 5 minutes, run butter knife around edge of cake and invert onto a wire rack and allow to cool completely.
Trim cakes level if needed. Add frosting to top of one round then top with second cake and frost top and sides of cake. Store in an airtight container.
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