Melt the butter in a large pot over low heat, stirring occasionally until liquid and not bubbling (about 3-5 minutes).

Stir in mini marshmallows into the melted butter, keeping the heat low and stirring for 3-4 minutes until melted and smooth.

Mix in vanilla extract into the melted marshmallow blend, stirring well.

Divide the mixture into 2-3 bowls, adding food coloring to create desired pastel shades and mixing well.

Fold in Rice Krispies cereal into each colored bowl, coating evenly without crushing the cereal.

Grease hands with cooking spray and shape the mixtures into egg forms, pressing mini chocolate eggs into centers if desired.

Place shaped treats on a parchment-lined sheet and let them set at room temperature for 10-15 minutes.