Microwave ¾ cup smooth nut butter and ⅓ cup honey in a large microwave-safe bowl until warm, about 30 seconds. (Alternatively, heat in a small saucepan over low heat.) Stir in 1 teaspoon vanilla extract if using and ¼ teaspoon kosher salt until combined.
Stir in 1 ½ cups old-fashioned rolled oats, ¼ cup finely chopped roasted nuts, and ¼ cup mini chocolate chips until combined.
Scoop the mixture out in 1 ½-tablespoon portions and place on a parchment paper-lined baking sheet. Roll each portion into a ball (lightly coat your hands with vegetable oil if the mixture is sticky). Refrigerate until firm, about 45 minutes.
