Put the oats, coconut, flaxseed, and chocolate chips in a bowl and stir. Add the peanut butter, honey, and vanilla and stir with a wooden spoon.
Line a 9x13 pan with wax paper or parchment paper.
Spread the mixture into the pan, pushing it up against the sides (you might need to use your hands).
Cover and place in the fridge to chill for at least an hour.
Remove from the fridge and lift the bars out on top of the wax paper or parchment paper.
Using a sharp knife or pizza cutter, slice them into bars. Place in another container with wax paper between the layers so they won't stick together.