01 -
Thoroughly grease each cup of a standard 12-cup muffin tin with butter to prevent sticking.
02 -
Combine unsalted butter and marshmallows in a large microwave-safe bowl. Microwave on high in 30-second intervals, stirring between each, until mixture is completely melted and smooth.
03 -
Immediately fold the crisp rice cereal and pinch of sea salt into melted mixture, stirring briskly until all cereal is evenly coated.
04 -
Spoon mixture evenly into prepared muffin cups. With buttered fingertips or waxed paper, press into the bottom and up the sides to create nest-shaped wells.
05 -
Let the nests set at room temperature for at least 30 minutes until completely firm.
06 -
Run a butter knife along the edges and gently lift each nest from the tin. Transfer to a wire rack or parchment-lined tray.
07 -
Beat softened butter in a mixing bowl until light and creamy. Gradually add powdered sugar, then beat in milk and vanilla extract. Tint with green food coloring and beat until evenly green and fluffy.
08 -
Transfer frosting to a piping bag fitted with a grass tip. Pipe green frosting onto each cooled nest to resemble grass.
09 -
Nestle a few candy eggs into the center of each frosted nest while the buttercream is still soft. Serve or store as desired.