This Cheesy Tomato Onion Skillet with Tuna & Eggs is a nutritious, savory, and flavor-packed one-pan recipe. Slices of juicy fresh tomatoes and crisp onion rings are lightly seared in olive oil, then topped with a well-seasoned whisked mixture of eggs, canned tuna, fresh parsley, and spicy chili peppers.
Finished with a generous layer of melted mozzarella cheese and briny sliced green olives, this quick 15-minute skillet makes a satisfying breakfast, lunch, or light dinner!
Recipe Overview
- Prep Time: 10 minutes
- Cook Time: 10–12 minutes
- Servings: 2–3 portions
Ingredients
For the Skillet Vegetable Base:
- 1 medium onion, sliced into round rings
- 1 large ripe tomato, sliced into rounds
- 2 tbsp extra virgin olive oil
For the Egg & Tuna Mixture:
- 4 large eggs
- 1 can (approx. 120g/4.2 oz) tuna in olive oil or water, drained
- ¼ cup fresh parsley, finely chopped
- 1 small fresh chili pepper, sliced (optional, for heat)
- ½ tsp salt (or to taste)
- ¼ tsp freshly ground black pepper
For the Cheesy Topping:
- 1 cup shredded mozzarella cheese
- ¼ cup green olives, sliced
Step-by-Step Instructions
1. Sear the Tomato and Onion Base
Heat 2 tablespoons of extra virgin olive oil in a non-stick skillet over medium heat. Arrange the onion rings and sliced tomato rounds in a single, neat layer across the bottom of the pan. Sauté for 2 to 3 minutes until the vegetables soften slightly and release their sweet aroma.
2. Whisk the Egg and Tuna Filling
In a medium mixing bowl, crack the 4 eggs and whisk well. Add the drained canned tuna, chopped fresh parsley, sliced chili pepper, salt, and freshly ground black pepper. Mix thoroughly to combine the ingredients evenly.
3. Assemble and Layer
Gently pour the egg and tuna mixture directly over the seared tomato and onion layer in the skillet, allowing it to spread evenly between the vegetable slices.
4. Add Toppings and Melt Cheese
Reduce the heat to low-medium. Sprinkle the shredded mozzarella cheese evenly over the egg mixture, then scatter the sliced green olives across the top.
5. Cover and Cook
Cover the skillet with a tight-fitting lid and cook on low heat for 6 to 8 minutes, or until the eggs are completely set and the mozzarella cheese is melted, bubbly, and gooey.
6. Serve Warm
Remove from heat and serve hot straight from the skillet!
Helpful Cooking Tips
- Drain Tuna Thoroughly: Make sure to drain the liquid or oil from the canned tuna before adding it to the eggs to avoid a watery skillet base.
- Keep Heat Low: Cook over low heat after adding the egg mixture so the bottom does not scorch before the eggs set and the cheese melts.
- Use Ripe, Firm Tomatoes: Select tomatoes that are ripe yet firm so they retain their shape while sautéing without releasing excessive moisture.
Tasty Customization Ideas
- Veggie Mix-ins: Add sliced bell peppers, sautéed mushrooms, or baby spinach along with the tomato and onion base.
- Cheese Swap: Substitute mozzarella with sharp Cheddar, Feta, or Gouda cheese for a different flavor profile.
- Milder Flavor: Replace the fresh chili pepper with sweet red bell pepper slices if you prefer a dish without heat.
Serving Suggestions
Serve this Cheesy Tomato Onion Skillet warm alongside warm pita bread, crusty French baguette slices, avocado slices, or a light cucumber-mint salad!
