Pre heat oven to 350 and prepare 2 baking sheets with parchment paper and cooking spray.
Place butter and brown sugar into a bowl, or the bowl of a stand mixer if using one. With either a hand mixer or stand mixer fixed with a paddle attachment, cream the butter and sugar together for at least 2 minutes.
Add in egg and vanilla and mix until incorporated.
Now add in the flour, oats, baking power and mix together until incorporated. Don't over mix.
Now mix and fold in the crushed mini eggs. I always save a little off to the side for adding to the top of the cookies before baking.
Using an ice cream scoop, scoop out the dough onto the prepared baking sheets leaving about 1 inch between cookies. Top cookies with extra crushed mini eggs.
Bake for 14 minutes. Once baking is done, remove from the oven and let cookies sit on the tray for an additional 5-10 minutes. You may want to push the cookies with the back of a spatula to flatten them out a little bit.
Enjoy!
