Creamy Chicken Curry

Okay, this recipe is really a guilty pleasure from when I was a kid.  It's utterly horrible for you, and I would never think to call it Indian food, but it is kinda tasty.

Ingredients:
1/2 cup butter
1 lg. onion, quartered and thinly sliced
2 celery stalks, diced
3 T curry powder
1/2 t coriander
3 C cubed cooked chicken
1 10 and 3/4 ounce can cream of chicken soup
1/2 C sour cream
1/2 C heavy cream
Cayenne if you want to up the heat level some

Melt the butter - saute the onion and celery until the onion is translucent.
Stir in 1 Tbsp curry powder and the coriander.
Cover and cook for 5 minutes.
Add the chicken and 1 Tbsp curry powder; cover and cook for 5 minutes.
Add the soup, sour cream, whipping cream, and 1 Tbsp curry powder, and cook until bubbling.
Serve over rice.