In a microwave-safe bowl, heat butter and marshmallows on HIGH for 3 minutes, stirring after 2 minutes. Stir until smooth. Add about 6 drops of green food coloring, or until desired color is reached.
Add cereal. Stir until well coated.
Using buttered spatula press mixture into 13 x 9 x 2-inch pan coated with cooking spray. Place in refrigerator to cool. Cut into 2-inch squares.
Place a marshmallow bunny and a few miniature eggs on top of each treat. If the bunnies fall over, put a little peanut butter on the bottom of each bunny and adhere it to each treat.