Louisiana Chicken Tetrazini

I had this when a mom from my MOMS Club made it for me after the twins were born.

One 16 oz box thin spaghetti noodles
1 stick butter or margarine
1 onion, finely chopped
1 bell pepper, finely chopped (optional)
a 2lb package velveeta cheese
2 cans Rotel diced tomatoes with green chilis (I usually use one can Rotel & one can regular diced tomatoes)
Chicken

Melt butter & saute the onion and pepper in the butter.
Add the cheese & diced tomatoes.Cook over low heat until cheese is completely melted.
After melted, add meat and simmer while spaghetti is cooking.
Boil and drain the noodles. Add meat mixture.

Pour into 9x13 glass pan or other large casserole dish & bake at 350 degrees until hot and bubbly.