In a large bowl, stir together oats, pistachios, cranberries, and chia seeds. Set aside.
In a medium pot, melt the butter, honey, and brown sugar together until it comes to a bubble. Reduce the heat then cook for 2 minutes more. Add vanilla to the pot and stir.
Pour the mixture over the dry ingredients and mix together until just moistened.
Pour onto prepared baking sheet and press out to about 3/4 inch thick - if your sheet is too big, you can press them all to one half of the baking sheet to make them thicker.
Let cool in refrigerator for 2 hours then cut them into bars.
Notes
These bars are very soft, unlike regular granola bars. Just keep that in mind that after you take them out of the fridge and cut them, sitting at room temperature, the bars will soften. :)