Step 1: Preheat the Oven - Begin by preheating your oven to 350°F (175°C).
Step 2: Combine Dry Ingredients - In a large mixing bowl, whisk together the all-purpose flour, baking soda, cheesecake pudding mix, and salt.
Step 3: Cream Butter and Sugars - In a separate bowl, use an electric mixer to cream the softened unsalted butter, brown sugar, and granulated sugar until light and fluffy.
Step 4: Add Eggs and Vanilla - Add the large eggs and vanilla extract to the creamed mixture, mixing until well combined.
Step 5: Combine Wet and Dry Ingredients - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until just combined.
Step 6: Fold in the Chocolate Chips and Sprinkles - Gently fold in the white chocolate chips and rainbow sprinkles.
Step 7: Scoop and Bake - Drop rounded balls of dough onto a parchment-lined cookie sheet and bake for 10-12 minutes.
Step 8: Cool and Enjoy! - Allow cookies to cool on the cookie sheet for 5 minutes before transferring to a wire rack.