Instructions:
Step 1
Preheat the oven to 375°F (190°C).
Step 2
Peel the onions and slice them thinly, about 1/2 inch (1.27 cm) thick.
Step 3
Separate the slices into rings and arrange them in a single layer in a baking dish.
Step 4
In a small bowl, combine the mayonnaise, shredded cheddar cheese, grated Parmesan cheese, garlic powder, paprika, salt, and pepper to create a cheesy topping.
Step 5
Spoon the cheese mixture evenly over the onion slices, covering them completely.
Step 6
Cover the baking dish with aluminum foil and bake in the preheated oven for approximately 25 minutes.
Step 7
Remove the foil after 10-15 minutes of baking and continue baking until the onions are soft and the top is golden and bubbling.
Step 8
Once done, garnish with chopped fresh parsley for a pop of color and added flavor.
Step 9
Serve hot as a delicious side dish alongside your favorite main courses.