Preheat oven to 350°.
To prepare sauce, combine first 5 ingredients in a small bowl. Cover and refrigerate.
Place potato in a large glass bowl; cover with plastic wrap. Microwave at high 5 minutes or until tender. Mash potato with a potato masher; cool.
Add breadcrumbs and next 9 ingredients (breadcrumbs through garlic) to potato; stir well. Divide mixture into 12 equal portions, shaping each into a 1/2-inch-thick patty.
Heat 1 tablespoon oil in a large nonstick skillet over medium-high heat. Add half of cakes; cook 2 minutes on each side. Place cakes on a baking sheet coated with cooking spray. Repeat procedure with remaining oil and cakes.
Bake cakes at 350° for 10 minutes. Serve with sauce. Garnish with parsley sprigs, if desired.