Melt the cacao butter in a small saucepan over low heat.
In a food processor, combine half of the cashews and half of the almonds, all of the mulberries, hemp seeds, coconut butter, lucuma powder, protein powder*, cinnamon, and nutmeg.
Remove cacao butter from heat and add honey to the saucepan.
Slowly pulse nuts and powder mixture in food processor while adding the melted cacao butter and honey in a steady stream. The mixture will form a dough-like texture.
Remove dough from processor and place in a bowl. Add remaining nuts, goji berries, and cacao nibs. Dough should be very thick. However, if it is too thick to mix, add 1 tablespoon of water at a time until the mixture combines, but remains very thick.
Press dough into a 13x9-inch baking dish and refrigerate for at least 1 hour.
Cut into bars.
Note: For chocolate protein bars, either use chocolate protein powder* or add 2 tablespoons of cacao powder in step 5.