Salted Caramel Crispy Treats

INGREDIENTS

• One 10-ounce bag mini marshmallows
• 1 teaspoon flaky sea salt, such as Maldon, plus more for sprinkling
• 1/4 cup heavy whipping cream
• 1/2 cup dark brown sugar
• 6 cups crispy rice cereal (about half a 12-ounce box), such as Rice Crispies
• 1 tablespoon light corn syrup
• 1 stick unsalted butter, cut into pieces
• Nonstick spray