Lightly grease a 13x18-inch jelly roll baking sheet , set aside.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.