A delightful twist on a classic baked onion dish, featuring a creamy cheese sauce and a crispy topping.
Preheat your oven to 350°F (175°C).
Ensure the oven is fully preheated before baking for even cooking.
Peel and slice the onions into thin rings.
Use a sharp knife to make slicing easier and safer.
In a mixing bowl, combine the sliced onions, 1 cup of shredded mozzarella cheese, butter, flour, milk, and salt. Mix until well combined.
Ensure the butter is softened for easier mixing.
Transfer the mixture into a greased baking dish, spreading it evenly.
Grease the dish with butter or cooking spray to prevent sticking.
Sprinkle the remaining mozzarella cheese and breadcrumbs evenly over the top.
For extra flavor, mix some melted butter with the breadcrumbs before sprinkling.
Bake in the preheated oven for 30 minutes, or until the cheese is bubbly and the breadcrumbs are golden brown.
Check the casserole halfway through to ensure even browning.
Let the casserole cool for a few minutes before serving. Enjoy!
Allowing it to cool slightly helps the flavors meld together.