Heat your oven to 350°F (180°C) to start.
Get a 9x9 inch pan ready by either lining it with parchment paper or coating it with a non-stick spray.
Take your crushed Cadbury Mini Eggs and put them into a bowl for later use.
Using a stand mixer, blend the butter and sugars together until they achieve a smooth, light, and fluffy consistency, which should take a couple of minutes.
After scraping down the sides of the bowl, incorporate the egg and vanilla into the mixture.
Once that’s thoroughly mixed, halt the mixer to add the flour, baking soda, and salt. Begin to mix at a low speed. When the flour blend is partially mixed in, add the crushed Cadbury Mini Eggs to the bowl and continue to mix until everything is evenly combined.
Set the dough to the side while we make the caramel.In a large microwave safe bowl, melt the caramels with the sweetened condensed milk for 30 seconds at a time, stirring and then continuing to microwave until the caramel can be stirred smooth. Set aside.
Split the dough in two, pressing one half into the bottom of your prepped pan.
Over this layer of dough, evenly pour and spread the caramel mixture.
With the remaining dough, arrange portions over the caramel layer until all of the dough has been used.
Bake in the preheated oven for 25-35 minutes, or until the top turns golden brown and the middle is set.
Allow the cookie bars to cool down completely before slicing.
Slice the bars to your preferred size and enjoy.
Keep the bars in a sealed container for up to three days to maintain freshness.