Mix dry ingredients, set aside. Whisk together yolks, lemon zest & juice, milk, oil and sugar. Add dry ingredients to this mixture. Whip 8 whites with stand mixer or hand mixer, gradually add 1/2 c sugar a little at a time until stiff peaks form. Fold egg whites into your lemon mixture until just incorporated.
Bake at 350 for 30-45 mins until toothpick inserted comes out dry.