Chocolate Sauce:
Place the chocolate in a glass or metal bowl.
Combine the cream and corn syrup in a small heavy nonreactive saucepan and bring to a simmer. Pour the liquid over the chocolate and allow it to sit for 3 to 4 minutes, or until the chocolate has melted. Whisk to combine. Allow the sauce to cool slightly. Set Aside.
Rice Krispie Treats:
Line a sheet pan with parchment paper. Spray with cooking spray. Set aside.
In large saucepan melt butter over low heat. Add marshmallows and stir until completely melted. Remove from heat, then immediately pour in rice krispies cereal and gently stir and fold with a spatula until cereal is evenly coated. Let mixture cool slightly (until it’s cool enough to handle with your hands).
Spray hands with non-stick cooking spray then shape cereal mixture into small balls. Transfer to prepared sheet pan. Drizzle with chocolate sauce. Set for at least an hour. Enjoy!