Microwave about 10 ounces of marshmallow peeps with the butter, 60-90 seconds. Stir until smooth, then add cereal and stir to combine.

Press mixture into greased 11x7 inch baking pan. Cool 30 minutes before cutting.

I had a 4.5-ounce package of yellow peeps and 3 ounces each of blue and pink. The colors were mixed in separate bowls, using these proportions:

To 4.5 ounces of peeps, add 2 tablespoons butter. Microwave 60 seconds to melt, then stir together until smooth. Add 2 cups cereal and stir to combine.

To 3 ounces of peeps, add 1.5 tablespoons butter. Microwave 60 seconds to melt, then stir together until smooth. Add 1.5 cups cereal and stir to combine.

Transfer to greased 11x7-inch baking dish by spreading out the colors, to try to make a marbled effect. Once all the mix is in the pan, press it firmly in place. Cool 30 minutes before cutting.

Additional peeps may be separated and placed on top of the treats.

Or, using a kitchen shears, cut off just the heads of the peeps(chicks) and use those to decorate. The bodies of the peeps can be cut up into smaller pieces and stirred into the bowl of rice krispies mix before pressing it into the pan. These unmelted pieces will be an extra chunk of marshmallow in the bites of Rice Krispies Treats.