Line an 8" brownie pan with parchment paper both ways.
In a large bowl, stir together the crispy rice cereal, oats, flaxseed, and salt.
In a large, microwave-safe bowl, stir together the brown rice syrup, macadamia butter, vanilla paste, vanilla extract, stevia extract, and butter flavor. Microwave at 20-second intervals, stirring between each one, until mixture is warm and runny. Stir in the protein powder. Dump in the rice cereal mix and fold together.
Scoop mixture into the brownie pan and flatten it out. Refrigerate for 2 hours, then slice.
Drizzle on the melted white chocolate and refrigerate until firm. Serve and enjoy!