Spaghetti Casserole

1. Brown the ground beef in a large skillet over medium-high heat. Drain off any excess grease.
2. Add the chopped onion and green bell pepper to the skillet and cook until softened, about 5 minutes.
3. Stir in the taco seasoning and pasta sauce and bring to a simmer.
4. In a separate saucepan, melt the butter over medium heat.
5. Whisk in the flour and cook for 1 minute.
6. Gradually whisk in the milk and bring to a simmer, stirring constantly, until the sauce has thickened.
7. Stir in the parmesan cheese and remove from heat.
8. Cook the spaghetti according to package directions. Drain and add to the cheese sauce.
9. Preheat oven to 350 degrees F (175 degrees C).
10. In a greased 9x13 inch baking dish, layer half of the spaghetti mixture, then all of the meat sauce, and then the remaining spaghetti mixture.
11. Top with the shredded cheddar cheese.
12. Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly.
13. Garnish with parsley and serve.