Preheat the oven to 350° F (180°C). Spray a 9x13 pan with non-stick spray and set aside.
Measure out the crushed cadbury mini eggs and mini chocolate chips. Set aside.
1 cup (200g) crushed cadbury mini eggs, 1 cup (240g) mini chocolate chips
In the bowl of a stand mixer, cream together the butter and sugars until smooth, light in color and fluffy. This will take about 2 minutes.
1 cup (222g) salted butter, 1 cup (246g) brown sugar, 1/2 cup (115g) granulated sugar
Scrape the sides of the bowl and mix in the egg and add the vanilla.
1 egg, 1 tsp vanilla
Once completely combined, stop the mixer and add in the flour, rolled oats, baking soda, and salt.
2 cup (304g) all-purpose flour, 1/2 cup (50g) rolled oats, 1 tsp baking soda, 1/2 tsp salt
Start mixing slowly. Once the flour mixture is about half way incorporated into the dough, pour the cadbury mini eggs and chocolate chips into the mixer and allow everything to mix together. Stop the mixer as soon as the flour is completely incorporated. Avoid over mixing.
Gently press the dough into the prepared 9x13 pan.
Bake at 350°F (180°C) for 18-20 minutes, or until the bars have risen and the edges are turning golden brown.
Allow the cookie bars to cool completely prior to cutting.
Enjoy! Store in an airtight container.