Preheat your oven to 350 degrees, with rack in the center position. Spray and line the bottoms of your cake pans with parchment paper and spray again, generously, with non-stick baking spray.
Using your stand mixer fitted with the flat beater (or paddle) attachment, beat together the Land O Lakes® Butter with Canola Oil and sugar on medium high speed until pale and fluffy, scraping down the sides of the bowl as needed, for about 2 minutes. Reduce the speed to medium-low and add the eggs, one at a time, beating after each addition.
In a separate bowl, whisk together the sour cream, milk and vanilla extract. Pour this into the bowl with the Land O Lakes® Butter with Canola Oil and sugar mixture. In a separate bowl, whisk together your dry ingredients: the flour, baking powder, baking soda and salt. Add your dry ingredients into the mixing bowl and mix on medium speed until smooth and incorporated.
Evenly divide the cake batter between the two cake pans and bake, rotating halfway through, until the tops spring back when gently touched and a cake tester inserted in the centers comes out clean, for about 30 minutes. Transfer to wire racks and let cool in pans for about 20 minutes.