Preheat Oven to 375F.

With a medium to large-sized storage bag add in the Cadbury eggs and mash until the eggs have broken into small to medium-sized pieces. Set aside until needed.

In a stand mixer with a paddle attachment or in a large bowl cream butter, brown sugar, and sugar. Beat until light and creamy for 2 to 3 minutes.

Scrape the sides and then add in the egg and vanilla extract. Beat the butter mixture until it just combines.

Into the large mixing bowl add all the dry ingredients (Flour, salt, baking powder, baking soda, and oats). Mix the dough until it's just combined and then add in the chopped white chocolate and Cadbury egg pieces.

Line a cookie sheet with parchment paper. Scoop the dough with a large cookie scoop or 3 tablespoon of cookie dough. Place 6 cookie dough balls onto a parchment lined baking sheet making sure they have plenty of space in between. Press more Cadbury eggs and white chocolate chunks on top of the cookies.

Bake cookies in a preheated 375 oven for 12-14 minutes or until the sides are golden brown and crisp.

Pull the cookies out and allow them to cool for 5 minutes before transferring them to a cooling rack to fully cool.