Chicken Mushroom Dijon

4 each chicken breast halves -- skinned & boned
1 teaspoon Lemon Pepper
1/4 teaspoon onion powder
1 cup Heavy cream
1 tablespoon Dijon mustard
1 cup mushrooms
2 tablespoons Butter

Sprinkle both sides of chicken with lemon-pepper seasoning and onion power. In a skillet cook chicken in margarine or butter over medium heat for 8 to 10 minutes, or till tender and no longer pink, turning once.
In a small mixing bowl mix together sour cream, cream and mustard.  Pour Mushrooms over chicken, pour mustard mixture over chicken and mushrooms.  Stir until sauce thickens and mushrooms and chicken are well coated.

NOTES : Can use 1/3 cup of sour cream and 2/3 cup of heavy cream (instead of 1 cup heavy cream) for a thicker sauce)