Taco casserole

This is not our usual kind of supper, but my family loves it so I make it once in a while. Is is good for a pot luck gathering.
1 pound ground beef
1 onion, diced
1/2 green pepper, diced
1/2 red pepper, diced
1 clove garlic, minced
1 jalepeno pepper, diced (optional)
1 jar of your favorite salsa ( I use pace or chi-chi's)
1 packet taco seasoning
cheddar cheese, shredded ( a few cups)
monterey jack cheese,shredded (a few cups)
whatever kind of pasta you want,cooked (I use scoobi-doos, or penne or elbow macaroni)
green onions
sour cream

Cook the pasta according to package directions. Meanwhile....

Fry up the ground beef and when it's almost done add the garlic, onions and peppers. Continue frying until the veggies soften up a bit. Spoon out as much of the fat as you can, then dump in the salsa and taco seasoning. If it looks too dry, you can add some tomato sauce or some tomato paste or just some water. After that heats up a bit add about 3/4 of each kind of cheese. Stir it in. Salt and pepper and season to taste. I often add cumin.
Stir in the cooked pasta, and dump it all in a 9x13 lasagna pan. Sprinkle the rest of the cheese over top. Bake it in a 350 oven for 20-30 minutes.
To serve sprinkle the green onions over top and serve with a dollop of sour cream.
For a variation, you can omit the noodles and serve it with a baguette or tortilla chips.