Place the freeze-dried strawberries in a food processor and pulse until they are reduced to a fine, even powder.
Packaged strawberry powder may also be used in place of processing the berries.
Check that the powder is finely ground so it blends smoothly into the coating mixture.
In a mixing bowl, stir the strawberry powder together with the confectioners’ sugar until the color and texture are fully uniform.
Transfer the strawberry-sugar mixture into a 1-gallon freezer bag, close it securely, and reserve it for coating the cereal.
Melt the white chocolate chips in the microwave in 30-second bursts, stirring thoroughly after each interval to keep the chocolate from overheating.
Once the chocolate is completely melted, pour it over the cereal in a large bowl and gently fold until the pieces are coated, taking care not to crush the cereal.
Add the chocolate-covered cereal to the freezer bag containing the strawberry-sugar mixture.
Seal the bag tightly and carefully shake or turn it until the cereal is evenly covered in the strawberry coating.
Spread the coated cereal across a baking sheet in an even layer.
Refrigerate for 15 minutes, or until the white chocolate has firmed.
After the coating has set, place the puppy chow in an airtight container to help preserve its crisp texture and freshness.