Instructions

• Grease a 13-by-9-inch baking pan or line it with parchment paper; set aside.
• Put the 6 cups/170 g rice crispies cereal into the largest mixing bowl you have; set the bowl near the stove.
• In a medium saucepan over medium-low heat, melt the 3 tablespoons/42 g butter, stirring occasionally.
• Add the 3 tablespoons/58 g sweetened condensed milk and the 1/4 teaspoon fine sea salt to the melted butter. Stir until combined and warmed through, about 1–2 minutes.
• Add the 10 ounces/283 g mini marshmallows to the pot. Stir constantly until the marshmallows are fully melted and the mixture is smooth.
• Remove the pot from the heat. Stir in the 1/2 teaspoon vanilla extract.
• Sift the 2 tablespoons/12 grams matcha directly over the hot marshmallow mixture, then stir until the matcha is evenly incorporated and the mixture is uniform in color.
• Immediately pour the matcha-marshmallow mixture over the cereal in the mixing bowl. Using a wide rubber spatula, gently fold and turn the cereal until every piece is completely coated. Work quickly while the mixture is still warm.
• Transfer the coated cereal mixture to the prepared pan. Using a spatula or lightly greased hands, press the mixture into an even layer—press enough to hold the treats together but do not compress tightly (press lightly to keep treats soft).
• Let the pan sit at room temperature until the treats are completely cool and set, about 30 minutes.
• Lift the set treats out of the pan (use the parchment if lined) and cut into triangles or other desired shapes.
• (Optional) For decoration: melt the 3 ounces/85 g white chocolate or candy coating gently in the microwave in 20–30 second bursts, stirring between bursts, or melt in a double boiler until smooth. Transfer to a piping bag, squeeze bottle, or a zip-top bag with a small corner cut off and drizzle over the cut treats. Sprinkle with sprinkles as desired. Allow the topping to set before stacking.
• Store the finished treats lightly covered at room temperature or in the refrigerator for up to five days.