1. 1. Preheat the oven to 375°F (190°C).

2. 2. Cook the ziti according to package instructions until al dente. Drain and set aside.

3. 3. In a large skillet, cook the diced andouille sausage until browned. Add in the diced tomatoes, black beans, corn, and tuna. Cook for 5-7 minutes.

4. 4. In a separate saucepan, melt butter over medium heat. Whisk in flour to create a roux. Slowly pour in the milk while stirring constantly until the sauce thickens.

5. 5. Remove the saucepan from heat and stir in the muenster cheese until melted.

6. 6. In a large mixing bowl, combine the cooked ziti, sausage mixture, and cheese sauce. Mix well to coat everything evenly.

7. 7. Transfer the ziti mixture to a baking dish. Top with mozzarella cheese and bake in the preheated oven for 25-30 minutes or until bubbly and golden brown on top.

8. 8. Serve hot with a drizzle of ranch dressing on top, if desired.

9. 9. Enjoy your Cheesy Baked Ziti with Andouille and Tuna!