Creating Crumbl Birthday Cake Cookies is straightforward when you follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper.
2. Mix Dry Ingredients: In a bowl, sift together the flour, baking soda, baking powder, and salt. Set aside.
3. Cream Butter and Sugars: In a large mixing bowl, beat the softened unsalted butter, granulated sugar, and brown sugar together until the mixture is fluffy and light.
4. Add Eggs and Vanilla: Beat in the eggs, one at a time, and then stir in the vanilla extract until well combined.
5. Combine Mixtures: Gradually mix the dry ingredients into the wet mixture until just combined.
6. Fold in Chocolate Chips and Sprinkles: Gently fold in the white chocolate chips and rainbow sprinkles.
7. Scoop the Dough: Use a cookie scoop or tablespoon to scoop dough onto the prepared baking sheets, spacing them about 2 inches apart.
8. Bake: Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden but the center remains soft.
9. Cool: Remove the cookies from the oven and allow them to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
10. Decorate (Optional): Once cooled, you can add additional sprinkles on top for a festive touch.

By following these steps, you’ll have soft, delicious cookies that are perfect for celebrating any occasion!