Preheat oven to 375. Heat a large saute pain over medium heat and add the avocado oil. Add ground beef and onion and saute 5-7 mins until browned and no longer pink. Add in the cauliflower rice along with all of the spices, and stir 3-4 additional minutes. Add the diced tomatoes and stir to combine. Turn to low and simmer while you begin to assemble to pie.
Spray a pie dish with avocado or olive oil. Place 1/2 of the tortillas (4 out of the 8) on the bottom of the dish to create the bottom layer of the pie, overlapping slightly to fit. Top with half of the beef/cauli/onion/tomato mixture. Layer the last 4 tortillas on top of that, and then top those with the remaining half of the beef mixture.
Bake the pie for 20 minutes. Top with avocado & cilantro (or cheese and sour cream if you tolerate dairy!) Enjoy!