Spray a 13 x 9-inch pan with cooking spray.
Combine oats, puffed rice, sunflower seeds, wheat germ and chocolate chips in a large bowl. Set aside.
Combine brown sugar, corn syrup and peanut butter in a microwave-safe bowl. Heat on HIGH (100%) for 2 minutes until mixture boils, stirring halfway through. Stir in vanilla extract.
Pour peanut butter mixture over cereal; stir until cereal is moist. Press firmly into 13 x 9-inch pan that has been sprayed with cooking spray. Let sit for one hour before cutting into bars.