Cheesy Nacho Bake

1 1/2 lb ground beef
1 can (14-1/2 oz) diced tomatoes, undrained
1 pkg (1-1/4 oz) taco seasoning mix
1 1/2 cups sour cream, divided
1 pkg (9 oz) tortilla chips (8 cups)
1 pkg (8 oz) shredded Colby & Monterey Jack cheese

Brown meat; drain.

Add tomatoes, 1/2 cup water and seasoning mix. Cook, uncovered, 10 minutes, stirring occasionally.

Stir in 1 cup of the sour cream. Place 1/2 of the chips in 13x9-inch baking dish; cover with 1/2 of the meat mixture and 1/2 of the cheese. Repeat layers.

Bake at 350 F for 20 minutes or until thoroughly heated. Top with remaining sour cream, chopped tomato and green onion, if desired.

Servings: 6