Homemade Gravy

Being constantly sick and so pregnant, I haven't felt like cooking much lately.  Don't worry, I still like to eat.  I just don't  have much energy lately.:)  Anyway, I made this amazing gravy for Easter.  It was absolutely delicious!  Creamy and so tasty!  Enjoy!
-1 stick unsalted butter
-about 2 cups chopped onion
-1/2 cup flour
-1 tsp salt
-1/2 tsp pepper
-2 cups chicken stock, warm
-1 Tbs heavy cream
Melt the butter in large saute pan.  Add the onions and cook on medium-low for about 15 minutes or until the onions are slightly brown.
Sprinkle the flour in the pan and whisk it in.  Add the salt and pepper, mix well and cook for a couple more minutes.  Add the warm chicken stock.  Cook uncovered for about 5 minutes or until thickened.  Add the heavy cream.  Stir and remove from heat.  Adjust the seasoning, if necessary and pour in serving dish.  Enjoy!