Creating Crumbl Birthday Cake Cookies is a straightforward process if you follow these simple steps:

1. Preheat your oven to 350°F (175°C). Prepare a baking sheet by lining it with parchment paper.
2. Mix Dry Ingredients: In a bowl, whisk together the flour, baking soda, baking powder, and salt until well combined.
3. Cream Butter and Sugar: In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
4. Add Eggs and Vanilla: Beat in the eggs one at a time, followed by the vanilla extract until thoroughly combined.
5. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
6. Fold in Sprinkles: Gently fold in the sprinkles, distributing them evenly throughout the cookie dough.
7. Scoop the Dough: Using a cookie scoop or spoon, drop rounded tablespoons of cookie dough onto the prepared baking sheet, leaving space between each one for spreading.
8. Bake: Place the tray in the preheated oven and bake for 12-15 minutes or until the edges are lightly golden.
9. Cool on Rack: Once out of the oven, let the cookies cool on the baking sheet for 5 minutes. Then transfer them to a wire rack to cool completely.
10. Frost and Garnish: Once cool, generously frost each cookie with vanilla frosting and sprinkle additional sprinkles on top for a festive look.

These steps will guide you in creating these wonderful cookies effortlessly!