This is a favorite of my girls and they pack them for every rehearsal it seems like.  If you want to make energy balls, you can leave out the coconut oil and get a softer product that you can shape into 1 Tbsp serving balls.  I usually put the bars into sandwich bags so kids can just grab a bag and go.

Melt together in soup pan:
1/4 c coconut oil
1 c peanut butter
2/3 c honey

Take the pan off the heat and stir in:
2 1/2 c oats
1 1/3 c shredded coconut
1 tsp vanilla
1 c ground flax seeds

When thoroughly combined, let cool for at least 15 - 30 min.

Stir in 1/2 c mini chocolate chips.

Spread into a greased 9x13 pan or you can line the pan with parchment.  Let cool in the fridge for several hours.   Cut into bars and serve.