Instructions

1. Preheat oven to 350 degrees. Prepare 3- 9 inch cake pans by spraying them with non stick spray and adding flour to the pan, making sure to coat all sides. This should prevent your cakes from sticking.
2. Cream the butter in the bowl of your electric stand mixer fitted with the paddle attachment. Add in 1 cup of sugar at a time, beating until incorporated and scraping down the sides as necessary. Continue this process until all 3 cups of sugar are mixed into the flour.
3. Add in the eggs, one at a time, making sure each is fully incorporated before adding in the next egg.
4. Sift together the flour, baking powder and salt.
5. In a small bowl, whisk together both milks and vanilla.
6. Add dry ingredients into the butter mixture alternating between the milk mixture. (For instance, add in 1/3 of the dry mix, fully incorporate, then add in 1/2 milk mixture, fully incorporate, 1/3 dry mixture, 1/2 milk mixture, ending with the dry.) Scrap down the sides of the bowl as necessary to make sure all ingredients are incorporated.
7. Distribute the batter evenly between the 3 pans.
8. To one pan, add in entire tube of blue gel food coloring. Stir to combine
9. To another pan, add in entire tube of red gel food coloring. Stir to combine
10. Bake for 25-30 minutes (Mine took 29 minutes) until a toothpick inserted into the center comes out clean.
11. Remove from oven and allow to cool.
12. Vanilla Buttercream Frosting
13. sticks of butter, softened
14. cups of confectioners sugar, sifted
15. tablespoon vanilla extract
16. tablespoons of milk
17. Add softened butter to the bowl of electric stand mixer fitted with the whisk attachment. Cream the butter for on medium speed for 4 minutes until light and fluffy.
18. Turn the mixer down to low and add confectioners sugar, 1 cup at a time, to the mixer, making sure to full incorporate before adding in the next.
19. Once mixture is fully incorporated, add in vanilla and beat for 1 minute on medium speed.
20. Turn the mixer to low, add in your milk, 1 tablespoon at a time. You may need more of less milk depending on how thick you want your frosting. I used 3 tablespoons as I didn't want mine too thick and easily spreadable.
21. Turn mixer up to medium and beat for 2 minutes until light and fluffy.
22. To assemble:
23. Start with the blue cake on the bottom and spread an even layer of frosting all over the top of the cake. Top with the white cake
24. Spread another layer of frosting on top of the white cake and place the red cake on top.
25. Spread the rest of the frosting all over the top and the sides of the cake making sure to cover all areas of the cake.
26. Decorate with sprinkles, star shapes, sparklers, etc.