Lazy Day Mexican Casserole

The title says it all on this one. If you want something quick and easy but different from the usual tacos this is it. I'm not sure if this can even be called a recipe or just a made up concoction, either way it works!
1 lb ground beef
1 small onion chopped
1 pkg. taco seasoning
1/2 c. water
1 c. enchilada sauce-about half of a 10 oz can
1 can refried beans
1/2 large bag of corn tortilla chips, lightly crushed
taco toppings-lettuce, tomato, cheese, sour cream, salsa, or guacamole

Cook ground beef and onion until completely cooked through. Add taco seasoning and water and cook for for another minute until seasoning is thoroughly mixed in. Add enchilada sauce and refried beans and mix until completely incorporated. Meanwhile pour 3/4 of your chips into greased 9x13 pan (this is where I just take my hands and lightly crunch the chips.) Top with ground beef mixture and top with remaining chips. Cook at 375 for 20 minutes topping with cheese in the last 5 minutes. Serve with taco toppings.