Mexican Pasta

I got this from my friend Angie (who found it in one of the little books of recipes (this one was vegetarian recipes) you often find with the magazines at checkout at grocery stores). It started out as stuffed shells, but I'm lazy so we progressed from stuffed shells, to lasagna, and now more of a "baked ziti" type thing (it can also be made into enchiladas, using flour toritillas).
8 oz cooked & drained pasta (shapes like penne or rototini work well)
2 tsp veg oil (I use olive oil)
1 med onion, chopped (1/2 c)
1 can pinto beans or black beans (or one of each if doing a double recipe). For those who make beans from scratch a can is generally about 2 c cooked beans.
1 1/2 tsp chili powder
1 pkg cream cheese, softened
3/4 c taco sauce
1 c shredded colby-jack cheese (or taco cheese) . . . or now that we use raw dairy, I'll probably try it with cheddar since that's what I can get raw.
1/2 c crushed corn chips
Sour cream to garnish

Heat oil in 2 qt saucepan over med heat. Cook onion in oil about 5 min, stirring frequently. Stir in beans, chili powder, cream cheese & 1/4 c taco sauce. Heat over med-low 2-3 min. stirring occasionally until cheese is melted. Heat oven to 350. Spray 8x8 pan with cooking spray. Stir mixture and pasta together and place in pan. Pour remaining taco sauce over top. Cover and bake 20 min. Sprinkle with cheese and corn chips. Bake uncovered 10 min. Garnish with sour cream.