Chicken Breasts with Orange Glaze

1-1/2 tsp. butter or margarine, melted
2 boneless, skinless chicken breast halves
1/2 tsp. cornstarch
1/4 tsp. ground mustard
1/4 C. orange juice
2 Tbsp. soy sauce

1. Melt butter in skillet over medium heat.  Cook chicken in butter about 15 minutes, turning once, until juice of chicken runs clear.
2. While chicken is cooking, mix cornstarch and mustard in small bowl.  Stir in remaining ingredients.
3. Place chicken on serving plate, cover to keep warm.  Discard any juices left in the skillet.
4. To make the glaze, pour orange mixture into skillet.  Heat to boiling over medium heat, stirring constantly.  Boil about 1 minute, stirring occasionally, until glaze is thickened.  Pour over chicken