Step 1: Grease the Pan - Start by greasing your 9x13 inch baking pan with a little unsalted butter.
Step 2: Melt the Butter - In a large saucepan over low heat, melt the 8 tablespoons of unsalted butter.
Step 3: Add the Marshmallows - Add 6 cups of the mini marshmallows to the saucepan and stir continuously until melted.
Step 4: Mix in the Vanilla and Salt - Remove from heat and stir in the vanilla extract and fine sea salt.
Step 5: Combine with Cereal - Add the crispy rice cereal to the marshmallow mixture and fold gently.
Step 6: Add Extra Marshmallows - Fold in the remaining 2 cups of mini marshmallows.
Step 7: Press into the Pan - Transfer the mixture into the prepared baking pan and press evenly.
Step 8: Cool and Cut - Allow to cool for about 30 minutes, then cut into squares.
