Place the Rice Chex cereal in a large mixing bowl and set aside.

Add the white chocolate chips and butter to a microwave-safe bowl.

Microwave in 20-second intervals, stirring after each interval, until the mixture is fully melted and smooth.

Stir in the vanilla bean paste and strawberry cake mix until completely combined and evenly colored.

Pour the warm strawberry–white chocolate mixture over the Rice Chex.

Gently fold the cereal with a spatula until all pieces are evenly coated.

Add the powdered sugar and crushed freeze-dried strawberries to a large zip-top bag.

Transfer the coated cereal to the bag, seal it, and shake until every piece is well coated and no shiny spots remain.

Spread the mixture in an even layer on a baking sheet and let it cool completely.

Once cooled and dry, sprinkle the mini marshmallows and crushed golden Oreos over the cereal and gently toss to combine.

Store the puppy chow in an airtight container at room temperature for up to 1 week.