Place 2 cups of pretzels into a gallon ziploc bag. Press all the air out and seal. Lay bag flat on counter and crush pretzels using a rolling pin. Measure 1 heaping cup of pretzels and place in a large bowl. Add peanuts and oats. Stir to combine. Set aside. 

In another small bowl, mix peanut butter, honey, and vanilla. Stir until completely combined. 

Pour peanut butter mixture over oat mixture in large bowl. Stir completely to combine. If mixture seems too dry you can add a little more peanut butter and honey if needed. You want to make sure mixture is slightly tacky so it will stick together better. 

Line an 8x8 inch baking dish with parchment paper. Pour mixture into dish and press to flatten out with the backside of a large, sturdy stirring spoon. You want to really take the time to press the mixture edge to edge a few times pretty hard to ensure your bars stay together.

Place baking dish in the freezer for at least 30 minutes or the fridge for at least an hour. When done, lift bars out of dish using your parchment paper. Place on a flat surface for slicing. Using a large Chef knife or Santoku knife, cut into bars. You should end up with 18-20 bars. 

Serve them for a snack or even dessert. You want to store them in the fridge or freezer. Enjoy!