Place the golden raisins in a small bowl and pour very hot water over them to cover; soak 5 minutes, then drain and pat lightly dry.
In a food processor fitted with the steel blade, add walnuts, 1/4 cup oats, and ground flaxseeds; process until the mixture is finely ground.
Add the drained raisins, honey, vanilla extract, kosher salt, and the 2 tablespoons reserved oats to the processor; pulse until a thick, sticky dough forms.
Remove the mixture, scoop and roll into small 1-inch balls using your hands.
Spread desired toppings on separate plates and roll each ball in a topping to coat.
Place the coated balls on a parchment-lined baking sheet and freeze briefly until no longer sticky, then transfer to an airtight container and store as desired.