Steps

• Begin by heating olive oil in a large frying pan over medium heat. Add the sliced onions and sauté them until they become translucent and caramelized, around 15 minutes. Stir in the minced garlic and cook for an additional 2-3 minutes, ensuring they don’t burn and turn a lovely golden brown.
• Push the onions to the side of the pan and add the ground beef. Cook it until it is fully browned and no pink remains, breaking it up with a spoon as it cooks. This should take about 5-7 minutes. Season with salt and pepper according to your preference.
• Once the beef is browned, lower the heat and add the can of cream of mushroom soup. Stir well to combine it with the beef and onion mixture, creating a creamy sauce that envelops the ingredients beautifully. Allow the mixture to come to a gentle simmer.
• Add the beef broth and sour cream to your beef mixture, stirring constantly to combine. This will create a rich, flavorful base for your casserole, ensuring every bite is deliciously creamy and moist. Adjust seasoning as needed.
• Preheat your oven to 350°F (175°C). Transfer the beef mixture into a baking dish, ensuring it is evenly spread. Top with the shredded cheddar cheese, which will melt into bubbly, golden goodness in the oven!
• Bake the casserole in the preheated oven for about 25–30 minutes, or until the cheese is bubbly and golden brown. Let it cool slightly before serving, allowing the flavors to meld together. Enjoy your delicious French Onion Ground Beef Casserole with a side salad or some crusty bread!