Add your Chex cereal, Bugles, pretzels and pecans to a large microwave safe bowl and set aside.
Melt your butter in the microwave and add your brown sugar, vanilla and pumpkin pie spice. Whisk so there are no lumps.
Pour your pumpkin spiced glaze over your dry mix and toss everything together GENTLY. I like to use my hands for this so I don't smash everything.
Microwave your mix for 2 minutes on high.Remove and toss gently with a rubber spatula or spoon.Place back in the microwave for another 2 minutes.Remove and toss gently.Add it back in for one more minute and toss on last time.
Spread mixture onto a nonstick baking pan or parchment paper and allow to cool. (about 5-10 minutes)
Mix in your candy corn and Reese's pieces and enjoy!
Use your hands to mix everything together if you can. If it's too hot, use a rubber spatula so you don't crush your cereal.Store your chex mix in plastic bags or a sealed container for 7-10 days.