Place all ingredients in high powered blender (such as a Blendtec or Vitamix) or a food processor. Process until blended. If you prefer the texture of coconut in the finished result, do not process completely.
Spread mixture into prepared pan and place in freezer.
In small saucepan, melt coconut oil and sweetener over low heat.
Remove from heat, add in remaining ingredients, and stir to combine.
Pour over chilled bottom layer. Return to the freezer until the chocolate layer is solid--about 15 minutes.
Cut into bars using a warmed knife (see Recipe Notes above)
Store covered in the refrigerator or freezer.
Any size pan will work but the bars will be thicker or thinner depending on the size.