To make Sour Cream Sauce, in mixing bowl, gently whisk together all sauce ingredients. Refrigerate. To make Irish Potato Cakes, in medium saucepan cook potatoes in 2 inches boiling water, covered, 12 to 15 minutes or until tender. Drain, then shake potatoes over low heat 1 to 2 minutes to dry thoroughly. With electric hand mixer or potato masher, mash potatoes until smooth. Beat in butter, milk and garlic until blended. Season with salt and pepper. Allow potatoes to cool; mix in cheese and green onions. To form potato cakes, shape 1/2-cup portions of potato mixture into patties; coat on all sides with bread crumbs. Place on wax paper-lined baking sheet and refrigerate at least 1 hour. In heavy non-stick skillet, heat oil over medium heat. Add potato cakes and cook about 5 minutes, turning once, or until heated through and golden on both sides. Place on serving platter or 6 individual plates; top each potato cake with 1 tablespoon Sour Cream Sauce.