In a mixing bowl, add sugar, brown sugar, butter, eggs, and vanilla. I just used my stand mixer on low with the paddle attachment, and mixed until it was combined well.
Stir in flour, baking powder, and salt. Add Cadbury eggs, the mixer will crush them up a bit.
Pour mixture into an ungreased 9x13 pan and spread evenly.
Bake 20-23 minutes, until golden brown and cooked throughout the center.
Allow them to cool for 45-1 hour.
Recipe by Life in the Green House at http://www.lifeinthegreenhouse.com/2015/03/cadbury-mini-egg-blondies.html