Baked Tomato Onion Casserole

Savor the delightful simplicity of this Baked Tomato Onion Casserole, a rustic dish that combines layers of juicy tomatoes, sweet caramelized onions, and a crispy Parmesan breadcrumb topping. Perfect as a side dish or a vegetarian main, this casserole highlights fresh, wholesome ingredients like ripe tomatoes, garlic, and fragrant thyme, baked to golden perfection. With minimal prep time and a melt-in-your-mouth texture, it’s a comforting yet elegant addition to your dinner table. Serve it warm and garnish with fresh parsley for a burst of color and flavor. Whether you're hosting a dinner party or planning a cozy family meal, this tomato onion casserole is sure to impress!

Nutriscore Rating: 74/100

Prep Time:15 mins

Cook Time:40 mins

Total Time:55 mins

Servings: 6

Ingredients

• 6 large tomatoes
• 2 large yellow onions
• 3 tablespoons olive oil
• 3 cloves garlic
• 2 teaspoons fresh thyme
• 1 teaspoon salt
• 0.5 teaspoon black pepper
• 0.75 cups breadcrumbs
• 0.5 cups grated Parmesan cheese
• 2 tablespoons fresh parsley
• 2 tablespoons butter

Directions

Step 1

Preheat your oven to 375°F (190°C).

Step 2

Slice the tomatoes and onions into 1/4-inch thick rounds and set them aside.

Step 3

Heat 2 tablespoons of olive oil in a large skillet over medium heat. Add the onions and cook for 8-10 minutes, stirring occasionally, until they become soft and lightly caramelized.

Step 4

Mince the garlic and add it to the skillet with the caramelized onions. Sauté for another minute until fragrant, then remove the skillet from heat.

Step 5

Lightly grease a 9x13-inch baking dish with 1 tablespoon of olive oil.

Step 6

Arrange a layer of tomato slices in the bottom of the baking dish, slightly overlapping each slice. Sprinkle with a pinch of salt, black pepper, and thyme.

Step 7

Spread half of the caramelized onion mixture evenly over the tomato layer.

Step 8

Repeat the layers—another layer of tomatoes, seasoning, and the remaining onions.

Step 9

In a small bowl, mix together the breadcrumbs, grated Parmesan cheese, and fresh parsley. Melt the butter and stir it into the breadcrumb mixture until evenly combined.

Step 10

Sprinkle the breadcrumb mixture evenly over the top layer of the casserole.

Step 11

Bake in the preheated oven for 25-30 minutes, or until the topping is golden brown and the casserole is bubbling around the edges.

Step 12

Allow the casserole to cool for a few minutes before serving. Garnish with additional parsley if desired.

Nutrition Facts

Serving size	1406.1 grams (1406.1g)

Amount per serving	% Daily Value*
Calories	1373

Total Fat 84.40g	108%
Saturated Fat 28.50g	143%
Polyunsaturated Fat 5.50g
Cholesterol 106mg	35%
Sodium 4506mg	196%
Total Carbohydrate 130.30g	47%
Dietary Fiber 19.40g	69%
Total Sugars 42.40g
Protein 38.90g	78%

Vitamin D 5IU	23%
Calcium 664mg	51%
Iron 7mg	39%
Potassium 2534mg	54%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 52.9%

Protein: 10.8%

Carbs: 36.3%