Favorite Rice Krispie Treats

Bahan-bahan (20 porsi)

• 3/4 cup (170g; 12 Tbsp) unsalted butter
• two 10-ounce bags (566g; 11 heaping cups) mini marshmallows
• 1/2 teaspoon pure vanilla extract
• pinch salt
• 9 cups (270g) crispy rice cereal