Line a loaf pan with parchment paper.
Combine cooked and cooled lentils, oats, peanut butter, honey, cinnamon and any optional ingredients of your choosing in a mixing bowl.
Press the mixture evenly into the bottom of the prepared pan. Cover and refrigerate for 10 minutes while preparing the chocolate.
In a microwave-safe bowl, melt chocolate in the microwave at 15-30 second increments until smooth. Remove pan from the fridge and pour the melted chocolate on top. Sprinkle with sea salt or crushed peanuts, if desired.
Chill the bars in the fridge for another 10 minutes.
Remove the loaf pan from the fridge. First, cut vertically down the pan, then cut horizontally to make 2-inch bars and enjoy!
Store in a sealed container in the fridge for up to 5 days.