Heat some vegetable oil in a skillet over medium heat, and toast the tortillas evenly on both sides until crispy.
Place 4 of the tortillas on a parchment lined or well greased baking sheet.
Top each of the 4 tortillas with the refried beans.
Brown the ground beef in a skillet over medium high heat until completely cooked through. Drain the excess grease.
Sprinkle the taco seasoning over the ground beef, and stir to combine well.
Spread a layer of the meat over the refried beans on the tortillas.
Place another crispy tortilla on top of each of the topped ones.
Spread a layer of enchilada sauce on top of each Mexican pizza, and top each pizza with a the cheese.
Bake for 10 minutes, or until the cheese has melted.
Remove, and top with the tomatoes and green onions before serving.