Tip: click step to get into cook mode
Line an 8-inch pan with parchment or wax paper.
Drain and rinse beans very well.
Blend all ingredients except chips in a good food processor (a blender works if you must, but you should routinely stop the blender and stir to ensure ingredients blend evenly).
Stir in chips.
Smooth into prepared pan, and freeze to set.
Optional chocolate coating: Chill bars at least half an hour, then either melt ½ cup chocolate chips with 2 tsp oil to form a thin sauce OR whisk ¼ cup cocoa powder, 2 tbsp melted coconut oil, and ¼ cup pure maple syrup or agave to form a sauce. Spread over the bars, then freeze to set the chocolate.