Mix quinoa, water, and broth in a small saucepan and bring to a boil. Cover, reduce heat and simmer 15 min. Fluff with a fork. Combine quinoa and remaining cake ingredients except oil in a medium bowl.
Heat a large nonstick skillet over medium heat. Spray with olive oil cooking spray. Scoop a generous 1/4 cup of the quinoa mixture at a time and drop onto skillet, flattening into pancake shape with back of spatula.