Preheat the oven to 350 degrees and generously coat two 9" round cake pans with oil (I like to use avocado oil spray).

To make the cake batter you will need three bowls. First, in a medium-sized bowl, add the flour, baking powder, salt, and baking soda. whisk together and set aside.

Next, In a small bowl, add sour cream and milk. Mix together and set aside.

In a large bowl, add butter and sugar. Using an electric mixer, beat together until smooth and creamy. Add in vanilla and beat again until smooth. Next, beat in egg whites, one by one, and then add whole eggs and beat again.

Add ¼ flour mixture into the butter mixture bowl, beat on low until mixed. Add ⅓ of the milk mixture, beat on low until mixed. Repeat this process with remaining flour and milk, ending with the flour mixture. When everything is in the bowl, beat on medium for an extra 10 seconds.

Add sprinkles into the batter and stir gently until just combined. Using a spatula, scoop the batter into the two round 9" cake pans. Bake for 30-35 minutes or until cake is golden brown on top and a toothpick comes out clean.