1. Slice mozzarella cheese into eight rounds about 1/2 in. thick. Place flour in first shallow dish. Lightly beat egg in second dish. Combine pecans, Parmesan cheese and bread crumbs in third dish. Lightly dredge each mozzarella round in flour, shaking off excess; dip into egg and then into pecan mixture, coating evenly.
2. Add oil to 10-in non-stick Skillet (do not use stainless cookware); heat over medium heat 1-3 minutes or until shimmering. Cook mozzarella rounds 1-2 minutes on each side or until coating is golden brown and cheese begins to soften around edges.
3. Add vinaigrette and mustard to Small Bowl; whisk until well blended. Cut tomatoes in half lengthwise. Divide mixed greens and tomatoes among serving plates; drizzle with vinaigrette and top with mozzarella rounds.