Grease an 8x8-inch baking tray with butter or non-stick spray, ensuring all corners are covered.

In a medium saucepan over low heat, melt 3 tablespoons of butter. Add 4 cups of marshmallows, stirring gently until smooth and fully melted (about 3-5 minutes).

Remove from heat and immediately add 6 cups of Rice Krispies cereal. Stir until coated with the marshmallow mixture.

Fold in optional add-ins like 1/2 cup of peanut butter or crushed Oreos, ensuring even distribution.

Pour the mixture into the prepared baking tray and spread it evenly without compacting.

Let cool at room temperature for about 30 minutes or refrigerate for 15 minutes to speed up the process.

Melt 1 cup of chocolate chips in a microwave-safe bowl, heating in intervals until smooth (1-2 minutes). Optionally mix in 1 teaspoon of coconut oil.

Drizzle the melted chocolate over the cooled treats and add sprinkles or nuts if desired.