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Preheat the oven to 350°F. Lightly coat a 9x13-inch baking dish with non-stick cooking spray.

Peel the onions and slice them into rounds about 1/4 inch thick. Keep the slices intact rather than separating them into rings.

Arrange the onion slices evenly across the bottom of the prepared baking dish.

Sprinkle the onions evenly with salt, garlic powder, and oregano.

Cut the butter into small pats and distribute them evenly over the seasoned onions.

Sprinkle the Italian blend cheese and cheddar cheese evenly over the onions, then finish with the Parmesan cheese on top.

Bake uncovered for 35 to 40 minutes, until the cheese is melted, bubbly, and lightly browned.

Serve hot for best flavor and texture.


Preheat the oven to 350°F. Lightly coat a 9x13-inch baking dish with non-stick cooking spray.

Peel the onions and slice them into rounds about 1/4 inch thick. Keep the slices intact rather than separating them into rings.

Arrange the onion slices evenly across the bottom of the prepared baking dish.

Sprinkle the onions evenly with salt, garlic powder, and oregano.

Cut the butter into small pats and distribute them evenly over the seasoned onions.

Sprinkle the Italian blend cheese and cheddar cheese evenly over the onions, then finish with the Parmesan cheese on top.

Bake uncovered for 35 to 40 minutes, until the cheese is melted, bubbly, and lightly browned.

Serve hot for best flavor and texture.
