Step 1: Prepare Your Pan: Start by greasing a 9x13 inch baking pan with a little butter or cooking spray. This will make it easier to remove the treats later.
Step 2: Melt the Butter and Marshmallows: In a large saucepan over low heat, melt the 3 tablespoons of unsalted butter. Once melted, add the 1 (10.5 ounce) bag of mini marshmallows. Stir continuously until the marshmallows are completely melted and smooth.
Step 3: Mix in the Cake Mix: Remove the saucepan from heat and stir in the 1/3 cup of dry yellow cake mix. Mix well until fully incorporated, ensuring there are no lumps.
Step 4: Add the Rice Krispies: Gradually add the 6 cups of Rice Krispie cereal to the melted marshmallow mixture. Gently fold the cereal into the mixture using a spatula until all the cereal is coated.
Step 5: Fold in the Sprinkles: Once the cereal is mixed in, add your colorful sprinkles. Gently fold them in, being careful not to crush them.
Step 6: Press into the Pan: Using a piece of wax or parchment paper, press the mixture evenly into the prepared baking pan.
