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Vegan “Tuna” Mushroom Casserole: A Comfort Food Classic Reimagined

My grandmother, bless her heart, had a tuna casserole that was legendary in our family. I remember the creamy, comforting aroma wafting through her cozy kitchen on Sunday afternoons. It was a dish filled with love, and a hefty dose of dairy and fish. As I transitioned to a vegan lifestyle, I missed that warm, familiar feeling. This vegan “tuna” mushroom casserole is my attempt to recapture that cherished memory, reinvented with plant-based goodness.

Recipe Overview

Prep Time: 15 minutes
Cook Time: 20-21 minutes
Total Time: 35-36 minutes
Servings: 6-8
Dietary Type: Vegan

Ingredients

1 medium onion, chopped
2 celery stalks, chopped
10 ounces baby portabella mushrooms, sliced
4 tablespoons vegan margarine
1 teaspoon soy sauce
¼ cup flour
2 cups vegetable broth
1 ½ cups plain soymilk
2 teaspoons lemon juice
1 cup canned chick-peas, drained and mashed
½ cup plain potato chips, crushed
½ cup French-fried onions
8 ounces fusilli pasta

Equipment Needed

8×8″ glass baking dish
Large pan or skillet
Medium soup pot
Whisk
Cooking oil spray

Instructions

Preheat your oven to 350 degrees F (175 degrees C) and lightly spray an 8×8″ glass baking dish with cooking oil to prevent sticking.
Heat 1 tablespoon of vegan margarine in a large pan or skillet over medium heat. Add the chopped onion, celery, and sliced mushrooms. Sauté the vegetables for several minutes, until they begin to soften and the mushrooms release their liquid.
Once the mushrooms have released their liquid, add the soy sauce to the pan. Continue cooking until all the vegetables are tender and slightly browned, stirring occasionally. Turn off the heat and set aside.
In a medium soup pot, melt the remaining 3 tablespoons of vegan margarine over low heat.
Add the flour to the melted margarine and whisk continuously for a few minutes. This creates a roux, which will help thicken the sauce. It will become quite thick and pasty.
Gradually add the vegetable broth, a little at a time, while whisking constantly to prevent lumps from forming. Continue whisking until the mixture is smooth and bring it to a boil.
Slowly pour in the soymilk, again a little at a time, stirring continuously to maintain a smooth consistency. Simmer the sauce over low heat, stirring frequently.
Add the cooked mushroom, celery, and onion mixture to the pot, along with the lemon juice. Season the sauce with salt, pepper, and a dash of paprika to taste. Paprika not only adds flavor, but also provides a touch of color.
In a small bowl, use a fork to mash the drained chick-peas. You want them to be somewhat broken down but still retain some texture.
Add the mashed chick-peas to the sauce, a spoonful at a time, stirring to evenly distribute them throughout the sauce. This will mimic the texture of tuna in a traditional casserole.
Meanwhile, cook the fusilli pasta according to the package directions until al dente, typically around 9 minutes.
Drain the cooked fusilli pasta and return it to the pot.
Pour the mushroom sauce over the drained pasta and stir gently to combine, ensuring the pasta is evenly coated.
Transfer the pasta and sauce mixture to the prepared 8×8″ baking dish.
Cover the baking dish tightly with aluminum foil to prevent the casserole from drying out during baking.
Bake in the preheated oven for 15 minutes.
Remove the foil from the baking dish. Sprinkle the crushed potato chips and French-fried onions evenly over the top of the casserole.
Return the uncovered casserole to the oven and bake for another 5-6 minutes, or until the top is golden brown and crispy. Keep a close eye on it to prevent burning.
Remove the casserole from the oven and let it cool for a few minutes before serving. This will allow the sauce to thicken slightly.

Expert Tips & Tricks

For extra flavor: Add a pinch of dried thyme or dill to the sauce. You could also sauté a clove or two of minced garlic along with the onions, celery, and mushrooms.
Make-ahead tip: The casserole can be assembled ahead of time and stored in the refrigerator (covered) for up to 24 hours before baking. Add a few minutes to the baking time if baking from cold.
Thickening the sauce: If the sauce is too thin, you can mix a tablespoon of cornstarch with a tablespoon of cold water and stir it into the sauce while it’s simmering. Simmer for a few more minutes until thickened.
Crispy topping: For a crispier topping, you can lightly toast the crushed potato chips and French-fried onions in a dry skillet before sprinkling them on top of the casserole.

Serving & Storage Suggestions

Serve the vegan “tuna” mushroom casserole warm, straight from the oven. It’s a comforting and satisfying meal on its own. Garnish with a sprinkle of fresh parsley or a drizzle of vegan sour cream for an extra touch.

Leftovers can be stored in an airtight container in the refrigerator for up to 3-4 days. To reheat, simply microwave individual portions or bake the entire casserole in a preheated oven at 350 degrees F (175 degrees C) until heated through. If the topping starts to brown too quickly, cover the casserole with foil.

While it’s possible to freeze this casserole, the texture of the pasta and sauce may change slightly upon thawing. Freeze in an airtight container for up to 2 months. Thaw overnight in the refrigerator before reheating.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	262.3 kcal	N/A
Calories from Fat	21 g	N/A
Total Fat	2.4 g	3%
Saturated Fat	0.3 g	1%
Cholesterol	0 mg	0%
Sodium	225.2 mg	9%
Total Carbohydrate	49.3 g	16%
Dietary Fiber	5.1 g	20%
Sugars	2.9 g	N/A
Protein	11.8 g	23%

Note: Nutritional information is an estimate and may vary based on specific ingredients and portion sizes.

Variations & Substitutions

Gluten-Free: Use gluten-free fusilli pasta and a gluten-free flour blend in place of all-purpose flour. Ensure your potato chips and French-fried onions are also gluten-free.
Different Vegetables: Feel free to add other vegetables to the casserole, such as peas, carrots, or green beans.
Nut-Free: If you’re allergic to nuts, make sure the vegan margarine and soymilk you use are nut-free.
Creamier Sauce: For an even creamier sauce, consider adding a quarter cup of vegan cream cheese or cashew cream.

FAQs (Frequently Asked Questions)

Q: Can I use a different type of pasta?
A: Absolutely! While fusilli works well, you can use any short pasta shape like rotini, penne, or elbow macaroni.

Q: What can I use instead of potato chips for the topping?
A: If you prefer, you can use crushed crackers or breadcrumbs mixed with a little melted vegan margarine for a crispy topping.

Q: Can I add more vegetables to the casserole?
A: Yes, feel free to add other cooked vegetables like peas, green beans, or corn to the mushroom mixture.

Q: Is it necessary to use soy milk?
A: While soy milk provides a creamy texture, you can substitute it with other plant-based milks like oat milk or cashew milk. Just be aware that the flavor might be slightly different.

Q: Can I make this casserole in a larger baking dish?
A: Yes, you can double the recipe and bake it in a 9×13″ baking dish. You may need to increase the baking time slightly.

Final Thoughts

This vegan “tuna” mushroom casserole is a wonderful way to enjoy a classic comfort food while staying true to your plant-based lifestyle. It’s simple to make, endlessly customizable, and sure to bring a smile to your face. I hope you’ll give this recipe a try and share it with friends and family. I would love to hear your feedback and any creative variations you come up with! Consider serving this casserole with a side of steamed green beans or a fresh garden salad for a complete and satisfying meal. Bon appétit!

Vegan “tuna” Mushroom Casserole Recipe