Dump wet, undrained canned tuna in the glass baking dish and 4 simple additions to get a dinner so savory your husband will be begging for it every week.
This simple tuna casserole is the kind of easy, comforting meal I turn to when the day gets busy but I still want something warm and satisfying on the table. As the name suggests, it begins with undrained canned tuna added straight to a baking dish, then combined with just four everyday ingredients you likely already have on hand. There are no noodles and no complicated steps, and it stays low in carbs—making it ideal for hectic weeknights or anyone looking for classic comfort with a lighter feel.
Serve it hot in hearty portions alongside steamed green beans or buttered broccoli. A fresh salad with a tangy vinaigrette helps cut through the richness, while crusty bread or soft rolls (if you’re not watching carbs) are perfect for soaking up the creamy sauce. For a nostalgic touch, add dill pickles or sliced tomatoes on the side.
🐟 5-Ingredient Tuna Casserole
📝 Ingredients
- Tuna in water — 3 cans (5 oz each), undrained
- Eggs — 3 large, beaten
- Sour cream — 1 cup, full-fat
- Cheddar cheese — 1½ cups shredded, divided
- Garlic powder — 1 tsp
- Salt — ½ tsp (or to taste)
- Black pepper — ½ tsp (or to taste)
- Cooking spray or butter — as needed for greasing
👩🍳 Directions
Preheat Oven
Set the oven to 375°F (190°C) and lightly grease a 2-quart glass baking dish.
Add Tuna
Pour the undrained tuna directly into the dish, breaking up any large chunks and spreading it evenly.
Prepare Mixture
In a bowl, whisk the eggs, then mix in the sour cream, 1 cup of cheddar, garlic powder, salt, and pepper until smooth and well combined.
Combine
Pour the mixture over the tuna, gently stirring or nudging so it settles throughout the dish.
Add Cheese Topping
Sprinkle the remaining ½ cup of cheddar evenly over the top.
Bake
Bake for 25–30 minutes, until the center is set and the edges are lightly golden.
Rest and Serve
Let the casserole rest for 5–10 minutes before serving. Store any leftovers covered in the refrigerator for up to 3 days.
Simple, filling, and low in carbs, this tuna casserole shows that comforting meals can come together easily with just a few basic ingredients and a bit of oven time.
