1. Add marshmallows and butter to a large microwave safe bowl. Heat on high heat for 2 minutes. Marshmallows will double in size and butter will be almost melted. 2. Add gelatin and stir well until butter is melted and strawberry is mixed well. 3. Add cereal and mix well to evenly coat cereal. 4. Press into prepared pan. 5. Let stand at room temperature to cool and firm up.