Measure cereal and pretzels into a large measuring cup or a bowl.
Add peanut butter, sugar and corn syrup to a large pan. Cook over medium heat until smooth and creamy, stirring occasionally.
Remove from heat. Add vanilla, cereal and pretzels and stir until coated.
Add cereal and pretzels. Gently toss until coated.
Let cereal mixture sit for 3-5 minutes until it has cooled a little. It needs to be cooled enough that the chocolate chips don’t get completely melted.
Add chocolate chips and quickly and gently toss to incorporate.
Scoop cookies onto lined baking sheet and let sit until firm.