Homemade Hamburger Helper -- Taco Mac

I made this over the weekend and it was very easy and good!  It's a nice change from the Italian pasta.

2 C of uncooked pasta (I used fusilli)
1 lb ground beef or turkey
1 onion -- chopped
1 clove garlic -- minced
1 14.5 oz of diced tomatoes -- drained
1/4 C of cream cheese
1/2 C of sour cream
1 packet of taco mix

Boil pasta until al dente. Reserve 1 cup of cooking liquid and drain the rest.  Set aside.

In a skillet, brown meat until done.  Drain well. Add chopped onions and garlic and cook for a couple of minutes.  Add tomatoes.  Cook another two minutes or so.  Add taco seasons and simmer for 5 minutes.  Add cream cheese and stir until melted.  Add sour cream.  If the sauce is too thick, add a bit of the reserved cooking liquid.  I added about 1/4 C.  Simmer until smooth.  Check for seasonings and adjust accordingly.  Toss sauce with cooked pasta.  I served this with grated sharp cheddar.  We didn't have any leftovers!