French Onion Casserole

All the best parts of French Onion Soup in an easy to make casserole! Cheesy, gooey, oniony and bread, glorious bread make this casserole a family favorite.

A potluck dish worth taking!

Perhaps you’re thinking I’ve gone a little off the deep end, French Onion Soup, Rustic Caramelized Onion, Cheese and Wine Tart and now French Onion Casserole. But really this is like French Onion Soup you can take and share. It has all the delicious qualities of French Onion Soup made into a casserole dish that you can take to potlucks or office parties.

French Onion Casserole

French Onion Soup Casserole, a tried and true potluck pleaser!
Prep Time10 mins
Cook Time1 hr
Total Time1 hr 55 mins
Course: Lunch, Main Dish, Soup
Cuisine: Mediterranean Inspired
Servings: 4 servings


  • 1/4 cup of butter
  • 2 large onions I used a red and a yellow onion
  • 1 loaf of French bread
  • 3 celery ribs sliced thinly
  • 1 Tablespoon flour
  • 1 quart organic beef broth
  • 1/4 cup coffee optional
  • 3 cups of shredded Swiss Cheese
  • 1/4 cup crispy onions


  • melt the butter in a heavy duty pot about 2 quarts in size
  • slice off the tops and bottoms of the onion, cut in half and then in slices
  • add to the butter stir to cover, reduce heat and cook for 45 minutes, stirring every 15 minutes or so
  • while the onions are caramelizing slice the entire loaf of bread into 1-2 inch cubes and set aside
  • after 30 minutes add the sliced celery and cook for the last 15 minutes with the onions
  • after 45 minutes add flour and cook for five minutes
  • preheat the oven to 350 degrees
  • stir in the beef broth and the coffee, if using, and cook for 10 minutes on medium
  • pour the soup into a 9X13 baking dish
  • top with all the bread chunks press down into the soup to make them all fit
  • cover with the shredded Swiss cheese and the crispy onions
  • bake for 15 minutes or until the top is crispy and browned
  • serve on plates or in bowls, it's thicker than soup, really a casserole with gooey bread and cheesy topside