1. Steam peas and asparagus, covered, 4 minutes or until crisp-tender. Rinse pea mixture with cold water; drain. Chill.
2. Place each chicken breast half between 2 sheets of heavy-duty plastic wrap; pound to 1/4-inch thickness using a meat mallet or small heavy skillet. Sprinkle chicken evenly with 1/2 teaspoon salt and pepper. Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add 2 breast halves to pan; sauté 2 minutes on each side or until done. Repeat procedure twice with remaining chicken. Add broth and wine to pan; bring to a boil, scraping pan to loosen browned bits. Cook until reduced to 1/2 cup (about 5 minutes). Remove from heat; stir in butter.
3. Combine remaining 1/4 teaspoon salt, mint, oil, rind, and juice, stirring well with a whisk. Drizzle oil mixture over pea mixture; toss gently to coat. Serve pea mixture with chicken and sauce. Garnish with lemon wedges.