To prepare chicken, combine first 4 ingredients; rub evenly over chicken. Heat oil in a large nonstick skillet over medium heat. Add chicken to pan; cook 5 minutes on each side or until done. Remove chicken from pan.
To prepare vinaigrette, add 2 tablespoons shallots and garlic to pan; cook for 3 minutes or until shallots and garlic begin to brown, stirring occasionally. Stir in red wine vinegar, orange rind, juices, honey, 1/2 teaspoon fennel, black pepper, and 1/4 teaspoon salt; cook over medium-high heat until reduced to 1/2 cup (about 1 minute). Remove vinaigrette from pan, and cool completely.
To prepare salad, chop chicken into bite-sized pieces. Combine chicken, spinach, and remaining ingredients in a large bowl. Add vinaigrette; toss gently to coat. Serve immediately.