Brown the hamburger. Drain the grease. Add broth, spices & tomato bouillon. Cook until reduced.
Preheat the oven to 375 degrees and grease an 8"x11" pan. With a knife spread about 2 Tbs of refried beans over the flour tortilla shells.
Place a hard shell in the center of the flour tortilla.
Gently press the flour tortilla around the hard shell.
Place the shells into a baking dish that has been sprayed with oil.
Fill the taco shells with the ground beef mixture.
Top the tacos 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. Don't forget the sour cream.