Ingredients
3 large sweet onions (Vidalia or Texas sweet)
1/2 cup (1 stick) unsalted butter, sliced into thin pats
1 cup shredded sharp cheddar cheese
1 cup shredded mozzarella cheese
1/2 cup grated Parmesan cheese
1 cup mayonnaise
1 teaspoon garlic powder
1 teaspoon paprika
1/2 teaspoon black pepper
1/2 teaspoon salt
1/2 teaspoon dried thyme (optional)
2 tablespoons fresh parsley, chopped (for garnish)
Instructions
- Preheat oven to 350°F (175°C).
- Peel onions and slice into 1/4-inch thick rounds; gently separate the rings.
- Arrange onion rings evenly in a 9×13-inch baking dish.
- Dot onions with thin pats of butter.
- In a bowl, combine mayonnaise, garlic powder, paprika, black pepper, salt, and thyme (if using); spread evenly over onions.
- Sprinkle cheddar, mozzarella, and Parmesan cheeses evenly on top.
- Bake uncovered for 40–45 minutes until golden and bubbling. For extra crispiness, broil for 1–2 minutes at the end if desired.
- Remove from oven, let rest for a few minutes, garnish with parsley, and serve warm.
Notes
- Vidalia onions are best, but Walla Walla or Maui can be substituted.
- Can be assembled ahead and baked just before serving.
- Greek yogurt or light mayo can be used for a lighter version, though flavor will differ.
- Add cayenne or red pepper flakes for heat.
- Store leftovers in the refrigerator for up to 3 days; reheat in the oven for best texture.
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
Nutrition
- Serving Size: 1/10 of recipe
- Calories: 310
- Sugar: 6g
- Sodium: 480mg
- Fat: 27g
- Saturated Fat: 13g
- Unsaturated Fat: 12g
- Trans Fat: 0g
- Carbohydrates: 11g
- Fiber: 2g
- Protein: 8g
- Cholesterol: 55mg
