Line an 8x8-inch baking pan with parchment paper, leaving the excess on the sides (to make removing the rice krispies from the pan easier). Spray the parchment paper with cooking spray; set aside.
Melt the butter over medium heat in a large pot. Add marshmallows and dark chocolate and stir constantly until melted and smooth. Add cocoa powder and vanilla extract, stirring to combine.
Remove from heat, then work quickly to stir in millet and cereal until well-coated. This will be messy!
Transfer the mixture to the prepared baking pan, cover with a sheet of wax paper, and press (using your hands or the base of a sturdy glass cup) to flatten and form the rice krispies. Press as hard as you can - this is what holds them together! While the rice krispies are warm, sprinkle with flaky sea salt.
Let set at room temperature for 2 hours until fully cooled, then use the excess parchment paper to remove the rice krispies from the pan. Cut into 16 squares and serve.
Keyword crispies, dark chocolate, krispies, Rice Crispies, Rice Krispies
Tried this recipe?Leave a comment below and tag @thisjess.cooks on social!