Line an 8x8 pan with parchment paper. Set aside.
Fill a large mixing bowl with the old fashioned oats.
Put pretzels in a food processor to chop up into small pieces. (You can also do this by hand). Set aside.
In a microwavable bowl, add honey. Microwave for 20 seconds.
Add peanut butter and vanilla to warmed honey and mix until creamy.
Add the peanut butter, vanilla, honey mixture to oats and mix.
Add crushed pretzels and mini chocolate chips.
Add mixture to the lined pan. Press firmly down to pack the mixture together.
Cover and set granola bars in the freezer for at least 1 hour.
Remove bars from freezer and allow to warm slightly before cutting.