Preheat oven to 350 degrees. Spray all three 8" cake pans with non-stick cooking spray and set aside.
In a medium mixing bowl, whisk together the milk and vanilla and set aside.
Using a standing mixer, beat together the butter and sugar until light and fluffy.
In a large mixing bowl, whisk together the flour and baking powder.
Alternating between the milk and dry ingredients, gradually pour into the butter mixture. Mixing on low to medium speed until combined.
Using another large metal mixing bowl and a hand mixer, beat the eggs until stiff peaks form.
Fold into the cake batter. Mix in the sky blue gel food coloring until combined. Divide the batter evenly between the three cake pans.
Bake in the oven for 23-26 minutes or until a toothpick comes out clean in the center. Allow the cakes to cool completely before removing from cake pans.
Place the cakes onto a cutting board. Using a cake slicer, remove the domes from the cakes. Place one layer of cake onto the cake board.