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- Preheat your oven to 375°F (190°C).
- Peel the onions and cut them into thick slices, approximately 1/2 inch (1.27 cm) thick. Separate the slices into rings and place them in a single layer in a baking dish.
- In a small bowl, mix together the shredded cheddar cheese, mayonnaise, grated Parmesan cheese, garlic powder, paprika, salt, and pepper. This creates a flavorful cheesy topping.
- Spoon the cheese mixture evenly over the onion slices, covering them with the mixture.
- Cover the baking dish with aluminum foil and bake in the preheated oven for about 25 minutes.
- Remove the foil and bake for an additional 15-20 minutes or until the onions are tender, and the top is golden and bubbling.
- If desired, garnish with chopped fresh parsley for added color and flavor.
- Serve hot as a savory side dish that complements various main courses.