Prepare a loaf pan by lightly spraying with non-stick spray then lining with parchment paper. Set aside.
In a large bowl combine all ingredients, minus the water & chocolate chips and mix until well combined. The mixture should be pretty thick and dense.
Slowly add in your water (amount will depend on your cashew butter and protein powder density), mixture will become more wet and start to stick together. When it sticks together stop! I recommend going very slow, you do NOT want it to be too wet. You can use more if you need!
Knead the dough with your hands if needed until it sticks together.
Add in any mix ins, like the chocolate chips, sprinkles, etc.
Take the dough and press it into your prepared loaf pan. Press HARD. Use all your might! You want these to be very firm and dense!
Place in the fridge for 1-3 hours before cutting into 8 bars and enjoying!