• Home
  • Recipes
    • breakfast
    • single-serve
    • easy snacks
    • something sweet
    • entrees
  • Favorites
    • My Pantry Staples
    • My Refrigerator/Freezer Staples
    • Discount Codes
  • Lifestyle
    • blog
    • Career
    • Contact
  • About Me
    • Email
    • Instagram
    • Pinterest

Wholesomely Hannah

healing through food, SCD-based recipes

June 2, 2021

Single-Serve Spaghetti Squash Tuna Casserole

high protein, single-serve tuna casserole recipe for the specific carbohydrate diet

I’ve become the QUEEN of cooking meals for one over these college years (I’m not a fan of leftovers TBH). So this mini tuna casserole has been a favorite easy dinner of mine for years. Its absolutely packed with veggies, protein, and cheese… what’s not to love?!

A Healthier Tuna Melt Casserole

If you’re a fan of tuna melt sandwiches, you will love this! Usually seafood and cheese don’t mesh well, but for some reason tuna is the exception. I feel like cheesy tuna melts are- for the most part- a popular sandwich option.

Grain-free dinner recipes that support gut health.

Since bread has been taken out of the equation for me since being diagnosed with ulcerative colitis last year, I’ve had to get creative in order to remake some of my favorite sandwiches. When I stumbled across a couple mini casserole dishes online one day, my mind immediately jumped to all of the fun casseroles and hot sandwiches I’ve been missing for the past year. Naturally, the classic tuna melt was one of the first things I tried to make SCD-friendly!

SCD Substitutions:

Luckily, both tuna and dry aged cheeses are “legal” on the Specific Carbohydrate Diet (SCD). The only thing I had to try and replace was the bread… which unfortunately is a very significant component of a tuna melt.

Cooking on the SCD

My solution: a casserole version of a tuna melt! By using a crispy spaghetti squash crust and fresh veggies, the texture contrast with the soft tuna filling and melted cheese was perfect.

If you aren’t familiar with the SCD, the diet was designed to focus on reducing inflammation and supporting gut health in people diagnosed with Irritable Bowel Syndrome (IBD). The SCD removes all large, hard-to-digest carbohydrates from the diet. AKA: no grains, gluten, or refined processed sugars and sweeteners.

  • Link: “SCD Legal/Illegal List” – Breaking the Vicious Cycle
  • Link: “One Year with UC: My Story”

Although there has been some minimally processed “illegal” foods that I’ve been able to add back in since my symptoms have been in remission, I still try and stick to the SCD guidelines for the most part!

  • Link: “How I Started Adding Non-SCD Foods Back into My Diet”

What Cheeses are “Allowed”?!

The world of cheese is large. Very large. I feel so overwhelmed by the cheese section of grocery stores more times than not. Hard, soft, aged, creamed, mold ripened, raw… like where do I start? For the Specific Carbohydrate Diet, the guidelines simply tell you not to eat processed cheese. Sounds simple enough, right?

But after taking a dairy class in college, it became very obvious to me that all cheeses are processed- at least to some extend. It’s the nature of what must be done to turn a liquid product (milk) into a solid cheese. So how processed is too processed?!

Cheese and the SCD Diet Infographic | Happy Gut For Life
http://scdforlife.com/2014/11/cheese-and-scd-diet-infographic.html

Turns out, as long as the cheese is adequately aged (very little lactose or carbohydrates remaining) and doesn’t contain any added ingredients, binders, or thickeners you’re good to go!

For this cheesy spaghetti squash tuna casserole recipe, I used a blend of asiago, parmesan, and fontina cheeses from Trader Joes.

How to make a Single-Serve Tuna Casserole

Step 1: In a small bowl, combine the cooked spaghetti squash, coconut flour, egg white, minced garlic, black pepper, salt, and smoked paprika. Mix well and press into the bottom of a lightly greased small casserole dish.

Step 2: Bake the crust for 20 minutes, until the edges are slightly golden-brown. Add the tuna, spices, veggies, and cheese on top.

A healthy spaghetti squash recipe
low carb dinner recipe
ingredients for a grain-free tuna casserole
how to make a healthy tuna casserole

Step 3: Bake for another 10 minutes & eat it while its warm and melty!

casserole recipe for the specific carbohydrate diet

I like to finish this dish with a touch of dried oregano and parsley on top.

What You’ll Need:

Print
clock clock iconcutlery cutlery iconflag flag iconfolder folder iconinstagram instagram iconpinterest pinterest iconfacebook facebook iconprint print iconsquares squares iconheart heart iconheart solid heart solid icon

Single-Serve Spaghetti Squash Tuna Casserole


  • Author: Hannah Carney
  • Prep Time: 10 minutes
  • Cook Time: 30 minutes
  • Total Time: 40 minutes
  • Yield: 1 serving 1x
  • Diet: Gluten Free
Print Recipe
Pin Recipe

Description

A healthier, single-serve cheesy tuna casserole recipe for the Specific Carbohydrate Diet! The crispy spaghetti squash base, melty cheese, and the savory spiced tuna filling make this dish one of my favorites to whip up on busy nights. Grain-free, SCD, Gluten-free, High protein, and packed with veggies!


Ingredients

Scale

Spaghetti Squash Base:

  • 1 cup cooked spaghetti squash
  • 1 tbsp. coconut flour
  • 1 egg white
  • 1/4 tsp. Himalayan pink salt
  • 1/8 tsp. pepper
  • 1/4 tsp. minced garlic
  • 1/4 tsp. dried oregano
  • 1/8 tsp. smoked paprika

Tuna Filling: 

  • 1, 5 oz. can of wild-caught tuna
  • 2 tbsp. Plain Greek Yogurt
  • 1/8 tsp. smoked paprika
  • 1/8 tsp. black pepper

Toppings: 

  • 1/4 cup baby spinach, finely chopped
  • 3 mini sweet peppers, sliced 
  • 1/3 cup shredded cheese (I used an asiago, parmesan, and fontina blend)

Instructions

  1. Preheat the oven to 400F. Lightly coat the bottom of a small casserole dish with avocado oil and set aside. 
  2. In a small bowl, combine the ingredients for the spaghetti squash base. Mix well and evenly press the mixture into the bottom of the casserole dish. Bake for 20- 25 minutes until the edges are golden-brown. 
  3. In a separate small bowl, combine the ingredients for the tuna filling together and mix. Transfer the tuna mixture on to the baked spaghetti squash base in the dish. 
  4. Layer the chopped spinach and sliced peppers on top of the tuna.
  5. Evenly sprinkle the shredded cheese on top. Bake for another 10 minutes and enjoy warm!
  • Category: entrees
  • Method: bake

Nutrition

  • Serving Size: 1 casserole
  • Calories: 300
  • Sugar: 2
  • Fat: 9
  • Carbohydrates: 7
  • Fiber: 2
  • Protein: 40

Keywords: specific carbohydrate diet, SCD, tuna casserole, single-serve, easy dinner, healthy dinner, tuna recipe, high protein, low carb, grain-free, gluten-free, gut health

Did you make this recipe?

Tag @wholesomely_hannah on Instagram

Share this:

  • Click to share on Facebook (Opens in new window) Facebook
  • Click to print (Opens in new window) Print
  • Click to share on Pinterest (Opens in new window) Pinterest

Filed in: entrees • by Hannah Carney •

You may also like

About Hannah Carney

search the blog

creating fun & wholesome recipes based on the specific carbohydrate diet to manage IBD. I also love long runs, brunch dates, and large coffees!
  • Email
  • Instagram
  • Pinterest
  • YouTube

Follow @wholesomely_hannah on Instagram

Popular Posts

Four Years with UC: Updates, Lessons, & Changes

Flourless Almond Butter Donuts (SCD & Paleo Friendly!)

Pintrest

Recent Posts

  • Four Years with UC: Updates, Lessons, & Changes
  • Flourless Almond Butter Donuts (SCD & Paleo Friendly!)
  • No-Bake Caramel Latte Collagen Bites
  • Single-Serve Salted Caramel Almond Baked Oats (GF, Low Sugar)
  • Prebiotic Apricot Macadamia Filled Cookies

Copyright © 2025 · Theme by Blog Pixie

graphic design by Kayla Hall