Matcha lovers: You're definitely going to want to try these.
Mix It Up: Line a 9-by-13-inch pan with foil and spray with cooking spray. In a large pot, melt the butter over high heat. Stir matcha powder into the melted butter. Add the bag of marshmallows and 1/2 tsp. salt and, using a silicone spatula, stir until smooth. Remove from heat. Add the cereal and mix until evenly coated. Mix in the remaining 2 cups marshmallows, stirring just until incorporated but not melted. Mix in 1 cup white chocolate chips.
Top It Off: Transfer the cereal to the prepared pan. Spray a clean spatula with cooking spray; pat the cereal into an even layer. Let cool for 2 hours. Melt 1/2 cup white chocolate chips and, using a fork, drizzle over the treats. Let stand until set, about 1 hour. Cut into squares.