Mix flour, oatmeal, and baking soda in a medium bowl. With a mixer, cream butter and sugars until light and fluffy. Reduce to low speed. Add salt, vanilla, and eggs, and beat for 1 minute until well combined. Add flour mixture gradually, beating until just combined. Stir in chocolate and Nature’s Eats Walnut Nuggets. Cover, and refrigerate until cold, about 30 minutes.