Creating Fireworks Sugar Cookie Cake can be a delightful experience if you follow these simple steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
2. Combine Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, and salt.
3. Cream Butter and Sugar: In another bowl, beat the softened butter and granulated sugar until light and fluffy.
4. Add Eggs and Vanilla: Mix in the eggs and vanilla extract, beating well until fully combined.
5. Combine Mixtures: Gradually add the dry ingredients to the butter mixture, mixing until just combined.
6. Fold in Sprinkles: Gently fold in the colorful sprinkles to add a festive touch.
7. Divide Batter: Pour the batter evenly into the prepared cake pans.
8. Bake: Place in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool the Cakes: Once baked, remove the cakes from the oven and let them cool in their pans for about 10 minutes. Then, transfer them to wire racks to cool completely.
10. Prepare the Frosting: In a bowl, combine the powdered sugar, milk, and vanilla extract. Mix until smooth and creamy.
11. Frost the Cake: Once the cakes are completely cooled, place one layer on a serving platter. Spread a layer of frosting on top, then place the second layer on top. Frost the top and sides of the entire cake.
12. Decorate: For an extra festive touch, sprinkle more colorful sprinkles on the top and sides of the cake.

These steps will guide you in creating this incredible cake effortlessly!