In large frying pan, add oil and saute onion with parsley and seasonings until lightly browned. Add cooked cubed potatoes and saute until golden brown. Add bacon and mix in gently. (At this point, you can put mixture in the frig until morning. Warm potato mixture before adding eggs.)
Whisk eggs, cream, salt and pepper together and then add 1 cup shredded cheddar cheese. Add potatoes and mix in gently.
Pour into greased quiche pan. Bake uncovered at 350 for 25 minutes. Top with 3/4 cup shredded cheddar cheese and bake for 20 minutes more. Total cooking time: 45 minutes. Remove from oven. Let sit for about 2 minutes and serve. Garnish with parsley.