In a skillet, brown the ground beef over medium heat. Drain.
Place ground beef back onto heat and stir in taco seasoning (prepared according to package).
Mix in refried beans and green chilies. Stir to combine.
Lightly spray a casserole dish with non-stick cooking oil.
Spread ground beef mixture evenly in casserole dish and sprinkle Mexican cheese on top.
Use a pizza cutter to cut three triangles out of a spinach tortilla.
Layer triangles on top of one another to create a tree.
Add olives for ornaments and red pepper strips for garland on top of the tortilla tree.
Use a small star cookie cutter to cut a star out of red pepper and add it to the top of the tortilla tree.
Bake taco bake 20-30 minutes, or until cheese starts to bubble.
Serve the taco bake with with sour cream, hot sauce, and tortilla chips.