Cook pasta in salted water according to package instructions.
In another pan with salted water, cook broccoli florets until fork tender.
Heat 2 tablespoons of extra virgin olive oil in a pan over medium heat and cook onion until lightly golden. Season with garlic powder and oregano. Stir to combine.
Drain the pasta.
Add tuna, pasta, white sauce, and cheddar cheese into the pan with cooked onion. Stir well to combine.
Pour the mixture into a 7x11 inch baking pan. Top with broccoli florets and sprinkle with grated Parmigiano and breadcrumbs.
Bake for 20 minutes.
Remove from the oven and let stand for at least 10 minutes before serving.
Serve and enjoy.
Notes
Add more flavor with spices that make a perfect match with tuna, like thyme, sage, or basil.
For extra creaminess, top with more grated cheddar cheese.
Broccoli and tuna go well with crunchy ingredients like nuts or seeds. You can chop and mix them with the rest of the ingredients or use them as a topping.