Preheat Oven: Get that oven roaring to 375°F (190°C).
Pasta Time: In a large pot, bring water to a boil. Add a pinch of salt and cook the pasta till al dente, which usually takes about 8-10 minutes. Once done, drain and set aside.
Sauté On: In a pan over medium heat, pour in the olive oil. Sauté onion and garlic till translucent. This usually takes about 3 minutes.
Flour Power: Sprinkle in the flour and whisk continuously for about 2 minutes or till you notice it turns golden brown. This will serve as the base for our creamy sauce.
Milk Magic: Gradually add the milk, whisking to avoid any lumps. Continue to cook until the sauce thickens.
Cheese Please: Fold in the cheddar cheese, stirring until melted and the sauce is smooth.
Tuna & Veggies: Add in the drained tuna and broccoli florets. Season with salt and pepper. Give it a good mix.
Combine: Now, combine the sauce mixture with the cooked pasta. Transfer it to a baking dish.
Crunch Factor: In a small bowl, mix the breadcrumbs with parmesan cheese and a pinch of paprika. Sprinkle this over the pasta.
Bake Away: Pop the baking dish in the preheated oven and bake for about 20 minutes or until the top turns golden brown.