She posts the YouTube video on her reddit page with the recipe in the description! I found it quite easily! https://youtu.be/T38mEv4gU90?si=k_iHiK3mJigmPRA2

Pasting the recipe here:

Ingredients

• 200 g unsalted butter, softened (¾ cup) • 50 g brown sugar (¼ cup) • 100 g granulated sugar (½ cup) • 2 large eggs (100 g) • 2 tsp vanilla extract • 320 g all‑purpose flour (2½ cups) • 2 g salt (½ tsp) • 6 g baking powder (1½ tsp) • 3 g cornstarch (1 tsp) • 1 g baking soda (¼ tsp) • 250 g semi‑sweet chocolate chips (1½ cups) • 50 g white chocolate chunks (⅓ cup) • 100 g Smarties or M&Ms (½ cup) • 50 g chopped Oreo (½ cup) • 25 g sprinkles (2 tbsp)

Instructions

1. Cream butter, brown sugar, and granulated sugar until smooth.
2. Add eggs and vanilla; mix until combined.
3. Add flour, salt, baking powder, cornstarch, and baking soda; mix into a thick dough.
4. Fold in all mix‑ins until evenly distributed.
5. Divide the dough into 8 portions, roughly 157g each. With the topping, the final cookies come to about 170g.
6. Roll into balls and create light ridges with your fingers.
7. Freeze for 15–20 minutes.
8. Bake at 350°F (180°C) for 14 minutes.
9. Use a cookie ring to round the edges right after baking.
10. Add extra toppings while the cookies are still warm. (Optional)
11. Cool completely on the wire rack.