i did a mexican night a few weeks ago when we had quests over. i finally found a white sauce like the kind we get at the local mexican place. it's super easy and delicious. good with plain old corn chips
http://allrecipes.com/Recipe/Mexican-White-Sauce/Detail.aspx
i also did some spanish rice to go in the burritos. i used 1 cup of rice with 2 cups of water, this was more than enough for 4 adults

1 cup of rice
2 cups of water
1 green bell pepper diced up
1 small onion diced up
cumin, chili powder, garlic powder, onion powder, tomato paste, black pepper
i put everything in a sauce pan with a little oil except the water and tomato paste
i saute the stuff until the veg starts to soften up. then i add the water and the tomato paste. bring to boil and then turn down to low, simmer off the water like cooking regular rice.