Lightly spray a 13 x 9 inch baking dish with cooking spray.
Pour Fritos corn chips into a large mixing bowl and set aside.
Combine corn syrup and sugar in a medium saucepan and heat until boiling.
Boil for exactly 1 minute only.
Remove from heat and stir in peanut butter until smooth.
Pour over chips and toss to coat.
Pour corn chip mixture into the greased pan and press to form an even layer.
Pour chocolate chips in a microwave safe bowl and microwave on high for 30 seconds and stir, then for 30 seconds more until just melted. Stir until smooth.
Pour melted chocolate into a zip top bag, press most of the air out and seal.
Cut off a small top of a corner of the bag and drizzle over the Fritos bars.
Allow to set (refrigerate to speed up the process).
Cut into squares and serve.