Start by browning the pound of ground hamburger. Cook through until no longer pink, around 8-10 minutes.
Then drain the grease from the pan. To the beef add the water, beef base, tomato bouillon, cumin and chili powder. Cook medium heat until the bouillon has dissolved and the sauce is reduced which just takes about 4 minutes.
Preheat the oven to 375 degrees and great an 8″x11″ pan the set up the assembly line. With a knife spread the refried beans over the flour tortilla shells. Place a hard shell in the center of the flour tortilla then add some the beef to the middle of that. Place the finished taco in the pan and repeat until all 6 of them are done.
Once all the tacos are assembled top them off with cheese then put them into the oven to bake for 15 minutes.
Chop up some lettuce, tomatoes and any other toppings you like. Open up some sour cream. Enjoy!