Melt the Marshmallows: In a large saucepan, melt 4 tablespoons of unsalted butter over low heat. Once melted, add 10 ounces of mini marshmallows and stir continuously for about 5-7 minutes until smooth.

Combine with Cereal: Remove from heat and stir in 6 cups of Blueberry Cheerios, ensuring the cereal is thoroughly coated with the marshmallow mixture.

Press into the Pan: Prepare a greased 9x13-inch baking pan. Pour the mixture into the pan and press it down evenly with a spatula or greased hands.

Allow to Cool: Let the pressed mixture sit at room temperature for at least 30 minutes or until completely cooled and set.

Cut into Squares: Lift the block from the pan and cut it into squares or rectangles using a sharp knife.

Optional Chocolate Dip: Melt 1 cup of chocolate and dip each square, allowing excess to drip off before placing on wax paper.

Let Chocolate Harden: Allow dipped bars to sit for about 15-20 minutes at room temperature to set.

Storage: Store leftover bars in an airtight container at room temperature for up to a week.