I found this recipe on Pinterest, but made a couple of changes. This is a VERY easy meal but VERY good! Our entire family loved it.
3 cups dry pasta, smaller pasta blends better
1-1/2 lbs. hamburger
1/2 cup diced onions
2 packages taco seasoning
2 cups water
8 oz. cream cheese
3 cups Monterey Jack/Colby cheese
Cook the pasta according to directions and set aside.
Cook the hamburger and onion together. Drain and return to pan.
Mix the taco seasoning with 2 cups of water and stir into meat. Bring to a boil and let this simmer for 5 minutes, to reduce the liquid.
Add cream cheese and stir until melted.
Remove from heat.
Put the pasta and 2 cups of the cheese in a 9x13 baking dish. Stir.
Top with meat mixture and stir to blend.
Top with remaining one cup of cheese.
Bake at 350 for 30 minutes.