EARLY IN THE DAY: Wash then cook potatoes in boiling water about 30 minutes, or just until tender. Drain peel, then cut into 1/4"-thick slivers; cool, refrigerate.
ABOUT 1/2 HOUR BEFORE SERVING: Shell eggs; cut in half, then remove yolks, chop whites and set aside. In small bowl, mash egg yolks, then add cottage cheese, red pepper, Tabasco, pepper, seasoned salt, salt, and cream; beat, with electric mixer at medium speed, until smooth. Gradually add olive oil while continuing to beat; blend in onion and parsley.
Around sides of large chop plate or platter, arrange lettuce leaves; heap potato slices in center; spread with cheese salad dressing, covering potatoes completely. Garnish with chopped egg whites, olives, and parsley sprigs.