In a large bowl combine peanut butter and honey.Add in protein powder and oat flour. It should come together into a ball. Batter will be slightly dry.Place a large piece of plastic wrap over an 8 x 8 inch baking pan so that it hangs over the sides.Put batter into pan and flatten with hands so it fills the entire pan. Make sure it's flat and even.Place in freezer for 20 minutes.While bars are in freezer, melt chocolate chips in the microwave. I heat in 20 second increments until smooth.Remove bars from the freezer and lift out of the pan using the plastic wrap.Cut into 12 bars.Using a knife spread chocolate onto bars. OR place in a ziploc bag and cut off a corner and drizzle over bars.Allow chocolate to cool completely.Store in an airtight container in the fridge or freezer.***