How can I make delicious DIY Rice Krispie treats at home?

To make delicious DIY Rice Krispie treats at home, melt butter in a large saucepan, add marshmallows and stir until melted. Remove from heat, add Rice Krispies cereal, and mix well. Press the mixture into a greased pan, let it cool, and cut into squares. Enjoy your homemade Rice Krispie treats!