Using butter or cooking spray, prepare a 9 x 13 pan 0r line with parchment paper.

In a medium to large saucepan, melt the butter over low heat.

Add the marshmallows and stir until completely melted.

Remove from heat.

Add the Rice Krispies cereal and stir until the cereal is well coated.

Butter your hands or use wax paper to press the mixture into the pan. Do not pack them down or the Rice Krispie treats will be hard.

Allow the Rice Krispies to cool completely at room temperature.  Do not place them in the refrigerator.

Line a cutting board or tray with parchment paper or wax paper.

Cut the Rice Krispie treats into 12 rectangles.

Heat melting chocolate chips by microwaving them in 30 second intervals, stirring after each interval.

Dip each of the Rice Krispie treats into the melted chocolate. Then place them on a piece of parchment paper.  Top with the sprinkles and allow them to set at room temperature.