For added depth of flavor, consider adding a clove of minced garlic to the onion and parsley mixture while cooking. Fresh basil leaves, torn and scattered over the casserole after baking, will add a bright, aromatic finish. If you don't have sour cream, plain Greek yogurt can be substituted for a tangier flavor. Feel free to experiment with different cheeses. Gruyere, mozzarella, or provolone would all be delicious additions or substitutions for the Parmesan. To prevent the top from browning too quickly, you can tent the casserole with aluminum foil during the last 10-15 minutes of baking.
Easy Vegetarian Tomato Casserole
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PREP TIME10 mins
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COOK TIME35 mins
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TOTAL TIME45 mins
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SERVING4 People
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VIEWS10
Indulge in the vibrant flavors of summer with this incredibly simple yet satisfying vegetarian casserole. Layers of juicy tomatoes are embraced by a creamy, tangy sauce and topped with a generous blanket of Parmesan, creating a dish perfect as a hearty side or a light vegetarian main course.
Ingridients
Adjust Servings
Nutrition
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Carbohydrate13 g
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Cholesterol163 mg
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Fiber3 g
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Protein17 g
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Saturated Fat21 g
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Sodium579 mg
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Sugar6 g
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Fat35 g
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Unsaturated Fat0 g
Follow The Directions
01
Step
5 mins
Melt the butter in a skillet over medium-low heat. Add the chopped onion and parsley and cook until softened and fragrant, about 5 minutes.
02
Step
2 mins
Preheat your oven to 350 degrees F (175 degrees C). Lightly grease a 9x13 inch casserole dish with butter.
03
Step
8 mins
Arrange a layer of tomato slices in the prepared casserole dish, overlapping slightly. Season lightly with salt. Distribute half of the cooked onion mixture evenly over the tomatoes, followed by half of the grated Parmesan cheese. Repeat with another layer of tomatoes, salt, onion mixture, and Parmesan.
04
Step
3 mins
In a separate bowl, whisk together the sour cream, eggs, and a pinch of salt until smooth. Pour this mixture evenly over the layered tomatoes.
05
Step
2 mins
Sprinkle the remaining Parmesan cheese over the top.
06
Step
30 mins
Bake in the preheated oven until the casserole is set, lightly browned, and bubbly around the edges, approximately 30 minutes.
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Conor Morissette
Jun 30, 2025My family loved this! It's a great way to use up all the tomatoes from my garden.
Dayana Cronin
Jun 17, 2025I used a mix of different colored tomatoes and it looked beautiful!
Lawson Sipes
Jun 17, 2025Easy to follow recipe, and the result was fantastic. A real crowd-pleaser!
Geraldine Runolfsdottir
Jun 15, 2025I wasn't sure about the sour cream, but it made the casserole so creamy and rich! Will definitely make this again.
Antonia Koelpin
Jun 11, 2025I made this for a vegetarian friend and she raved about it. It's now a go-to recipe for me.
Camryn Kozey
Jun 5, 2025This was so simple and delicious! I added some garlic like one of the comments suggested and it was perfect.