Spray a standard muffin tin generously with non-stick cooking spray.

Melt the butter and mini marshmallows in a large pot over low heat until smooth.

Stir in the Cocoa Krispies until well coated.

Press a spoonful of the warm cereal mixture into each muffin cup, using a greased spoon to press a deep indentation into the center, forming a cup/nest shape.

Let cool completely before removing from the tin.

Pipe a small swirl of green decorating icing (to look like grass) into the bottom of each nest, then top with 3 pastel Cadbury Mini Eggs.