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Preheat oven to 350 degrees.
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Line a 9x13 baking dish with foil, leave some overhang to make removal easier.
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Spray foil generously with nonstick cooking spray.
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In the bowl of a stand mixer, beat butter, granulated sugar, and brown sugar together until fluffy.
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Add in eggs and vanilla extract and continue to beat.
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Lower speed of mixer and add flour, baking soda and salt and mix until combined.
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Add M&M's and crushed Cadbury Chocolate Egg pieces and give a final stir.
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Transfer cookie dough to prepared baking dish.
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Press additional M&M'S, into top of cookie dough.
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Bake 35 to 40 minutes on oven rack in lower third of oven to prevent over browning.
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Remove from oven and immediately press whole Cadbury Mini Chocolate Eggs into top of cookie bars while they are still hot.
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Let cool and cut.