Stir together stir fry sauce, drained juice from oranges (about 1/4 cup) and honey in small bowl; set aside.
Heat oil in medium skillet over medium-high heat. Add chicken; cook until no longer pink, stirring occasionally. Add stir fry sauce mixture and bring to a boil. Cook 2 minutes or until mixture thickens slightly. Remove skillet from heat; cool slightly.
Divide spinach between 2 serving plates. Top evenly with chicken mixture and mandarin oranges. Sprinkle with almonds.