Place 1 cup walnuts in a food processor. Turn the processor on to chop the nuts into tiny bits while you’re getting the other ingredients out. You should end up with approximately ½ cup of chopped walnuts.
Turn the food processor off, then add everything else except the raisins. Process for about 1 minute, until mixture looks well-mixed and crumbly.
Add raisins, and pulse a few times so the raisins get mixed in and chopped up a bit.
Using your hands, form dough into one-inch balls.
Place in air-tight container and refrigerate until serving.
Notes
When I originally published this recipe, it called for 3 tablespoons of maple syrup. I've since started making these with just 2 tablespoons, and I like them even better with less sweetener. Win-win!
Recipe by I Wish I Was a Muffin at https://iwishiwasamuffin.com/oatmeal-protein-balls/