Spray an 8x8-inch glass baking pan with cooking spray.
Place cashews in a food processor; grind until the consistency of flour.
Combine ground cashews, rice cereal, sunflower seeds, nut butter, agave, oats, and flaxseed meal in the bowl of a stand mixer; blend until smooth.
Press cashew mixture firmly into the prepared baking pan with a spatula.
Melt chocolate in a microwave-safe glass or ceramic bowl in 15-second intervals, stirring after each melting, 1 to 3 minutes. Spread over cashew mixture.
Chill in the refrigerator until set, about 5 minutes. Cut into 1-inch squares.
