Vegetarian Casserole – Potato, Onion, Tomato

This vegetarian casserole is made with potatoes, mushrooms, tomatoes, onions and fresh cheese.It is superb and can be served as a light meal or as a side for roasted chicken or beef. In fact, I love to serve it with breaded beef milanesas sometimes.

This is what you will need for this recommended vegetarian casserole recipe:

Serves eight
6 Russet potatoes, peeled and sliced into 1/2 inch rounds
1 medium yellow onion, thinly sliced
4 garlic cloves, minced
3 medium tomatoes, chopped
8 white mushrooms, sliced
1 tablespoon dried oregano leaves
1/2 tablespoon dried basil leaves
1 tablespoon tomato paste
1/4 cup water
1 cup grated white fresh cheese (Farmers, Panela, etc.)
Salt & Pepper
Olive oil

Preheat oven to 375 degrees.

Heat a skillet with some olive oil. Add the onions and cook, stirring occasionally until they start browning, about 7 to 8 minutes. Add the garlic and mix well. Cook for one minute until fragrant. Add the mushrooms, oregano, basil and the tomatoes. Stir well. Move all the veggies aside forming a well in the middle. Place the tomato paste in the well and add the water. Mix well to dilute and then mix with the rest of the vegetables. Bring to a soft boil, lower the heat, and cook for 10 minutes. Season with salt and pepper.

Tomato, Mushroom Sauce

Coat the bottom of a casserole dish with some olive oil. Arrange a layer of potato slices. Pour some of the tomato sauce on the potatoes and arrange a second layer of potatoes on top of that. Cover with the rest of the tomato sauce and top with the grated cheese.

Potatoes, Sauce and Cheese

Place the potato casserole in the oven and bake for 45 to 50 minutes, until potatoes are cooked, sauce is bubbling and cheese is melted and browned.

Potato, Onion & Tomato Casserole

Serve and enjoy!

Print the Potato, Onion & Tomato Casserole Recipe Here

My name is Mary Ann Allen and I am here to help you get organized so you can save money on groceries and feed your family healthy, nutritious food. My multi-cultural cooking background comes from being born in the US and raised in Bolivia. I have 5 kids and own around 400 cook books. I absolutely love to cook!


  • April 2, 2013


    Good recipe

  • April 4, 2013


    Hi Janet!
    Thank you very much for stopping by! I am happy you like this. Take care!
    Mary Ann