Lightly toast 1 cup of California walnuts in a dry saute pan for about 2 minutes or until just turning brown and aromatic. Remove from heat and let cool.
To make walnut butter, process the toasted California walnuts with 1 tsp honey in the food processor until it forms a thin nut butter paste.
Once the walnut butter gets creamy, add the Greek yogurt and process again until well combined.
Add another 1/2 cup of California walnuts (not toasted) and all of the remaining ingredients. Process until mixture becomes fully combined.
Remove mixture from the food processor and place in a small bowl. Cover and place in the fridge for at least an hour or overnight.
When ready, roll mixture into 10-12 balls. If desired, roll balls in cocoa powder or shredded coconut.