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Golden-brown Caramelized Sweet Onion Casserole in a white dish, topped with crispy cracker layers and fresh herbs

Caramelized Sweet Onion Casserole

This Caramelized Sweet Onion Casserole is a delicious, time-saving baked sweet onion side dish that transforms humble ingredients into a rich, buttery masterpiece in just 40 minutes!
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Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings: 10 servings
Course: Side Dish
Cuisine: American
Ingredients Method Notes

Ingredients
  

  • 5 large sweet onions, halved and sliced
  • 1/2 cup butter
  • 1/2 cup crushed butter-flavored crackers (about 12 crackers)
  • 1/2 cup grated Parmesan cheese

Method
 

  1. Preheat your oven to 350°F and grease a 2-quart baking dish.
  2. In a large skillet, melt the butter over medium heat. Add the onions and sauté until they’re tender and just starting to caramelize—about 10 minutes.
  3. Layer half of the sautéed onions evenly in the prepared baking dish. Sprinkle with half of the crushed crackers and half of the Parmesan cheese.
  4. Repeat the layers with the remaining onions, crackers, and cheese.
  5. Slide the dish into your preheated oven and bake, uncovered, for 25-30 minutes. You’re looking for a golden-brown, bubbly top.

Notes

Optional: Save time slicing by using a mandoline or food processor. You can assemble the casserole up to a day in advance and store it covered in the fridge.